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sys/kern/vfs_syscalls.c
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1 /* $NetBSD: vfs_syscalls.c,v 1.279.2.6 2011/03/20 20:36:56 bouyer Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.279.2.6 2011/03/20 20:36:56 bouyer Exp $"); 41 42 #include "opt_compat_netbsd.h" 43 #include "opt_compat_43.h" 44 #include "opt_fileassoc.h" 45 #include "opt_ktrace.h" 46 #include "fss.h" 47 #include "veriexec.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/namei.h> 52 #include <sys/filedesc.h> 53 #include <sys/kernel.h> 54 #include <sys/file.h> 55 #include <sys/stat.h> 56 #include <sys/vnode.h> 57 #include <sys/mount.h> 58 #include <sys/proc.h> 59 #include <sys/uio.h> 60 #include <sys/malloc.h> 61 #include <sys/kmem.h> 62 #include <sys/dirent.h> 63 #include <sys/sysctl.h> 64 #include <sys/sa.h> 65 #include <sys/syscallargs.h> 66 #ifdef KTRACE 67 #include <sys/ktrace.h> 68 #endif 69 #ifdef FILEASSOC 70 #include <sys/fileassoc.h> 71 #endif /* FILEASSOC */ 72 #if NVERIEXEC > 0 73 #include <sys/verified_exec.h> 74 #include <sys/syslog.h> 75 #endif /* NVERIEXEC > 0 */ 76 #include <sys/kauth.h> 77 78 #include <miscfs/genfs/genfs.h> 79 #include <miscfs/syncfs/syncfs.h> 80 81 #ifdef COMPAT_30 82 #include "opt_nfsserver.h" 83 #include <nfs/rpcv2.h> 84 #endif 85 #include <nfs/nfsproto.h> 86 #ifdef COMPAT_30 87 #include <nfs/nfs.h> 88 #include <nfs/nfs_var.h> 89 #endif 90 91 #if NFSS > 0 92 #include <dev/fssvar.h> 93 #endif 94 95 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct"); 96 97 static int change_dir(struct nameidata *, struct lwp *); 98 static int change_flags(struct vnode *, u_long, struct lwp *); 99 static int change_mode(struct vnode *, int, struct lwp *l); 100 static int change_owner(struct vnode *, uid_t, gid_t, struct lwp *, int); 101 static int change_utimes(struct vnode *vp, const struct timeval *, 102 struct lwp *l); 103 static int rename_files(const char *, const char *, struct lwp *, int); 104 105 void checkdirs(struct vnode *); 106 107 int dovfsusermount = 0; 108 109 /* 110 * Virtual File System System Calls 111 */ 112 113 /* 114 * Mount a file system. 115 */ 116 117 #if defined(COMPAT_09) || defined(COMPAT_43) 118 /* 119 * This table is used to maintain compatibility with 4.3BSD 120 * and NetBSD 0.9 mount syscalls. Note, the order is important! 121 * 122 * Do not modify this table. It should only contain filesystems 123 * supported by NetBSD 0.9 and 4.3BSD. 124 */ 125 const char * const mountcompatnames[] = { 126 NULL, /* 0 = MOUNT_NONE */ 127 MOUNT_FFS, /* 1 = MOUNT_UFS */ 128 MOUNT_NFS, /* 2 */ 129 MOUNT_MFS, /* 3 */ 130 MOUNT_MSDOS, /* 4 */ 131 MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ 132 MOUNT_FDESC, /* 6 */ 133 MOUNT_KERNFS, /* 7 */ 134 NULL, /* 8 = MOUNT_DEVFS */ 135 MOUNT_AFS, /* 9 */ 136 }; 137 const int nmountcompatnames = sizeof(mountcompatnames) / 138 sizeof(mountcompatnames[0]); 139 #endif /* COMPAT_09 || COMPAT_43 */ 140 141 /* ARGSUSED */ 142 int 143 sys_mount(struct lwp *l, void *v, register_t *retval) 144 { 145 struct sys_mount_args /* { 146 syscallarg(const char *) type; 147 syscallarg(const char *) path; 148 syscallarg(int) flags; 149 syscallarg(void *) data; 150 } */ *uap = v; 151 struct vnode *vp; 152 struct mount *mp; 153 int error, flag = 0; 154 char fstypename[MFSNAMELEN]; 155 struct vattr va; 156 struct nameidata nd; 157 struct vfsops *vfs; 158 159 /* 160 * if MNT_GETARGS is specified, it should be only flag. 161 */ 162 163 if ((SCARG(uap, flags) & MNT_GETARGS) != 0 && 164 (SCARG(uap, flags) & ~MNT_GETARGS) != 0) { 165 return EINVAL; 166 } 167 168 if (dovfsusermount == 0 && (SCARG(uap, flags) & MNT_GETARGS) == 0 && 169 (error = kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, 170 &l->l_acflag))) 171 return (error); 172 /* 173 * Get vnode to be covered 174 */ 175 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, 176 SCARG(uap, path), l); 177 if ((error = namei(&nd)) != 0) 178 return (error); 179 vp = nd.ni_vp; 180 /* 181 * A lookup in VFS_MOUNT might result in an attempt to 182 * lock this vnode again, so make the lock recursive. 183 */ 184 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); 185 if (SCARG(uap, flags) & (MNT_UPDATE | MNT_GETARGS)) { 186 if ((vp->v_flag & VROOT) == 0) { 187 vput(vp); 188 return (EINVAL); 189 } 190 mp = vp->v_mount; 191 flag = mp->mnt_flag; 192 vfs = mp->mnt_op; 193 /* 194 * We only allow the filesystem to be reloaded if it 195 * is currently mounted read-only. 196 */ 197 if ((SCARG(uap, flags) & MNT_RELOAD) && 198 ((mp->mnt_flag & MNT_RDONLY) == 0)) { 199 vput(vp); 200 return (EOPNOTSUPP); /* Needs translation */ 201 } 202 /* 203 * In "highly secure" mode, don't let the caller do anything 204 * but downgrade a filesystem from read-write to read-only. 205 * (see also below; MNT_UPDATE or MNT_GETARGS is required.) 206 */ 207 if (securelevel >= 2 && 208 SCARG(uap, flags) != MNT_GETARGS && 209 SCARG(uap, flags) != 210 (mp->mnt_flag | MNT_RDONLY | 211 MNT_RELOAD | MNT_FORCE | MNT_UPDATE)) { 212 vput(vp); 213 return (EPERM); 214 } 215 mp->mnt_flag |= SCARG(uap, flags) & 216 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 217 /* 218 * Only root, or the user that did the original mount is 219 * permitted to update it. 220 */ 221 if ((mp->mnt_flag & MNT_GETARGS) == 0 && 222 mp->mnt_stat.f_owner != kauth_cred_geteuid(l->l_cred) && 223 (error = kauth_authorize_generic(l->l_cred, 224 KAUTH_GENERIC_ISSUSER, &l->l_acflag)) != 0) { 225 vput(vp); 226 return (error); 227 } 228 /* 229 * Do not allow NFS export by non-root users. For non-root 230 * users, silently enforce MNT_NOSUID and MNT_NODEV, and 231 * MNT_NOEXEC if mount point is already MNT_NOEXEC. 232 */ 233 if (kauth_cred_geteuid(l->l_cred) != 0) { 234 if (SCARG(uap, flags) & MNT_EXPORTED) { 235 vput(vp); 236 return (EPERM); 237 } 238 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 239 if (flag & MNT_NOEXEC) 240 SCARG(uap, flags) |= MNT_NOEXEC; 241 } 242 if (vfs_busy(mp, LK_NOWAIT, 0)) { 243 vput(vp); 244 return (EPERM); 245 } 246 goto update; 247 } else { 248 if (securelevel >= 2) { 249 vput(vp); 250 return (EPERM); 251 } 252 } 253 /* 254 * If the user is not root, ensure that they own the directory 255 * onto which we are attempting to mount. 256 */ 257 if ((error = VOP_GETATTR(vp, &va, l->l_cred, l)) != 0 || 258 (va.va_uid != kauth_cred_geteuid(l->l_cred) && 259 (error = kauth_authorize_generic(l->l_cred, 260 KAUTH_GENERIC_ISSUSER, &l->l_acflag)) != 0)) { 261 vput(vp); 262 return (error); 263 } 264 /* 265 * Do not allow NFS export by non-root users. For non-root users, 266 * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the 267 * mount point is already MNT_NOEXEC. 268 */ 269 if (kauth_cred_geteuid(l->l_cred) != 0) { 270 if (SCARG(uap, flags) & MNT_EXPORTED) { 271 vput(vp); 272 return (EPERM); 273 } 274 SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; 275 if (vp->v_mount->mnt_flag & MNT_NOEXEC) 276 SCARG(uap, flags) |= MNT_NOEXEC; 277 } 278 if ((error = vinvalbuf(vp, V_SAVE, l->l_cred, l, 0, 0)) != 0) { 279 vput(vp); 280 return (error); 281 } 282 if (vp->v_type != VDIR) { 283 vput(vp); 284 return (ENOTDIR); 285 } 286 error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); 287 if (error) { 288 #if defined(COMPAT_09) || defined(COMPAT_43) 289 /* 290 * Historically, filesystem types were identified by numbers. 291 * If we get an integer for the filesystem type instead of a 292 * string, we check to see if it matches one of the historic 293 * filesystem types. 294 */ 295 u_long fsindex = (u_long)SCARG(uap, type); 296 if (fsindex >= nmountcompatnames || 297 mountcompatnames[fsindex] == NULL) { 298 vput(vp); 299 return (ENODEV); 300 } 301 strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); 302 #else 303 vput(vp); 304 return (error); 305 #endif 306 } 307 #ifdef COMPAT_10 308 /* Accept `ufs' as an alias for `ffs'. */ 309 if (!strncmp(fstypename, "ufs", MFSNAMELEN)) 310 strncpy(fstypename, "ffs", MFSNAMELEN); 311 #endif 312 if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { 313 vput(vp); 314 return (ENODEV); 315 } 316 if (vp->v_mountedhere != NULL) { 317 vput(vp); 318 return (EBUSY); 319 } 320 321 /* 322 * Allocate and initialize the file system. 323 */ 324 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 325 M_MOUNT, M_WAITOK); 326 memset((char *)mp, 0, (u_long)sizeof(struct mount)); 327 lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); 328 simple_lock_init(&mp->mnt_slock); 329 (void)vfs_busy(mp, LK_NOWAIT, 0); 330 mp->mnt_op = vfs; 331 vfs->vfs_refcount++; 332 mp->mnt_vnodecovered = vp; 333 mp->mnt_stat.f_owner = kauth_cred_geteuid(l->l_cred); 334 mp->mnt_unmounter = NULL; 335 mp->mnt_leaf = mp; 336 mount_initspecific(mp); 337 338 /* 339 * The underlying file system may refuse the mount for 340 * various reasons. Allow the user to force it to happen. 341 */ 342 mp->mnt_flag |= SCARG(uap, flags) & MNT_FORCE; 343 update: 344 if ((SCARG(uap, flags) & MNT_GETARGS) == 0) { 345 /* 346 * Set the mount level flags. 347 */ 348 if (SCARG(uap, flags) & MNT_RDONLY) 349 mp->mnt_flag |= MNT_RDONLY; 350 else if (mp->mnt_flag & MNT_RDONLY) 351 mp->mnt_iflag |= IMNT_WANTRDWR; 352 mp->mnt_flag &= 353 ~(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 354 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 355 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); 356 mp->mnt_flag |= SCARG(uap, flags) & 357 (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | 358 MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | 359 MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | 360 MNT_IGNORE); 361 } 362 /* 363 * Mount the filesystem. 364 */ 365 error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, l); 366 if (mp->mnt_flag & (MNT_UPDATE | MNT_GETARGS)) { 367 VOP_UNLOCK(vp, 0); 368 #if defined(COMPAT_30) && defined(NFSSERVER) 369 if (mp->mnt_flag & MNT_UPDATE && error != 0) { 370 int error2; 371 372 /* Update failed; let's try and see if it was an 373 * export request. */ 374 error2 = nfs_update_exports_30(mp, SCARG(uap, path), 375 SCARG(uap, data), l); 376 377 /* Only update error code if the export request was 378 * understood but some problem occurred while 379 * processing it. */ 380 if (error2 != EJUSTRETURN) 381 error = error2; 382 } 383 #endif 384 if (mp->mnt_iflag & IMNT_WANTRDWR) 385 mp->mnt_flag &= ~MNT_RDONLY; 386 if (error) 387 mp->mnt_flag = flag; 388 mp->mnt_flag &=~ 389 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 390 mp->mnt_iflag &=~ IMNT_WANTRDWR; 391 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { 392 if (mp->mnt_syncer == NULL) 393 error = vfs_allocate_syncvnode(mp); 394 } else { 395 if (mp->mnt_syncer != NULL) 396 vfs_deallocate_syncvnode(mp); 397 } 398 vfs_unbusy(mp); 399 vrele(vp); 400 return (error); 401 } 402 /* 403 * Put the new filesystem on the mount list after root. 404 */ 405 cache_purge(vp); 406 if (!error) { 407 mp->mnt_flag &=~ 408 (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); 409 mp->mnt_iflag &=~ IMNT_WANTRDWR; 410 vp->v_mountedhere = mp; 411 simple_lock(&mountlist_slock); 412 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 413 simple_unlock(&mountlist_slock); 414 VOP_UNLOCK(vp, 0); 415 checkdirs(vp); 416 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 417 error = vfs_allocate_syncvnode(mp); 418 vfs_unbusy(mp); 419 (void) VFS_STATVFS(mp, &mp->mnt_stat, l); 420 if ((error = VFS_START(mp, 0, l))) 421 vrele(vp); 422 } else { 423 vp->v_mountedhere = (struct mount *)0; 424 vfs->vfs_refcount--; 425 vfs_unbusy(mp); 426 free(mp, M_MOUNT); 427 vput(vp); 428 } 429 return (error); 430 } 431 432 /* 433 * Scan all active processes to see if any of them have a current 434 * or root directory onto which the new filesystem has just been 435 * mounted. If so, replace them with the new mount point. 436 */ 437 void 438 checkdirs(struct vnode *olddp) 439 { 440 struct cwdinfo *cwdi; 441 struct vnode *newdp; 442 struct proc *p; 443 444 if (olddp->v_usecount == 1) 445 return; 446 if (VFS_ROOT(olddp->v_mountedhere, &newdp)) 447 panic("mount: lost mount"); 448 proclist_lock_read(); 449 PROCLIST_FOREACH(p, &allproc) { 450 cwdi = p->p_cwdi; 451 if (!cwdi) 452 continue; 453 if (cwdi->cwdi_cdir == olddp) { 454 vrele(cwdi->cwdi_cdir); 455 VREF(newdp); 456 cwdi->cwdi_cdir = newdp; 457 } 458 if (cwdi->cwdi_rdir == olddp) { 459 vrele(cwdi->cwdi_rdir); 460 VREF(newdp); 461 cwdi->cwdi_rdir = newdp; 462 } 463 } 464 proclist_unlock_read(); 465 if (rootvnode == olddp) { 466 vrele(rootvnode); 467 VREF(newdp); 468 rootvnode = newdp; 469 } 470 vput(newdp); 471 } 472 473 /* 474 * Unmount a file system. 475 * 476 * Note: unmount takes a path to the vnode mounted on as argument, 477 * not special file (as before). 478 */ 479 /* ARGSUSED */ 480 int 481 sys_unmount(struct lwp *l, void *v, register_t *retval) 482 { 483 struct sys_unmount_args /* { 484 syscallarg(const char *) path; 485 syscallarg(int) flags; 486 } */ *uap = v; 487 struct vnode *vp; 488 struct mount *mp; 489 int error; 490 struct nameidata nd; 491 492 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 493 SCARG(uap, path), l); 494 if ((error = namei(&nd)) != 0) 495 return (error); 496 vp = nd.ni_vp; 497 mp = vp->v_mount; 498 499 /* 500 * Only root, or the user that did the original mount is 501 * permitted to unmount this filesystem. 502 */ 503 if ((mp->mnt_stat.f_owner != kauth_cred_geteuid(l->l_cred)) && 504 (error = kauth_authorize_generic(l->l_cred, 505 KAUTH_GENERIC_ISSUSER, &l->l_acflag)) != 0) { 506 vput(vp); 507 return (error); 508 } 509 510 /* 511 * Don't allow unmounting the root file system. 512 */ 513 if (mp->mnt_flag & MNT_ROOTFS) { 514 vput(vp); 515 return (EINVAL); 516 } 517 518 /* 519 * Must be the root of the filesystem 520 */ 521 if ((vp->v_flag & VROOT) == 0) { 522 vput(vp); 523 return (EINVAL); 524 } 525 vput(vp); 526 527 /* 528 * XXX Freeze syncer. Must do this before locking the 529 * mount point. See dounmount() for details. 530 */ 531 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 532 533 if (vfs_busy(mp, 0, 0)) { 534 lockmgr(&syncer_lock, LK_RELEASE, NULL); 535 return (EBUSY); 536 } 537 538 return (dounmount(mp, SCARG(uap, flags), l)); 539 } 540 541 /* 542 * Do the actual file system unmount. File system is assumed to have been 543 * marked busy by the caller. 544 */ 545 int 546 dounmount(struct mount *mp, int flags, struct lwp *l) 547 { 548 struct vnode *coveredvp; 549 int error; 550 int async; 551 int used_syncer; 552 553 #if NVERIEXEC > 0 554 error = veriexec_unmountchk(mp); 555 if (error) 556 return (error); 557 #endif /* NVERIEXEC > 0 */ 558 559 #ifdef FILEASSOC 560 (void)fileassoc_table_delete(mp); 561 #endif /* FILEASSOC */ 562 563 simple_lock(&mountlist_slock); 564 vfs_unbusy(mp); 565 used_syncer = (mp->mnt_syncer != NULL); 566 567 /* 568 * XXX Syncer must be frozen when we get here. This should really 569 * be done on a per-mountpoint basis, but especially the softdep 570 * code possibly called from the syncer doesn't exactly work on a 571 * per-mountpoint basis, so the softdep code would become a maze 572 * of vfs_busy() calls. 573 * 574 * The caller of dounmount() must acquire syncer_lock because 575 * the syncer itself acquires locks in syncer_lock -> vfs_busy 576 * order, and we must preserve that order to avoid deadlock. 577 * 578 * So, if the file system did not use the syncer, now is 579 * the time to release the syncer_lock. 580 */ 581 if (used_syncer == 0) 582 lockmgr(&syncer_lock, LK_RELEASE, NULL); 583 584 mp->mnt_iflag |= IMNT_UNMOUNT; 585 mp->mnt_unmounter = l; 586 lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); 587 vn_start_write(NULL, &mp, V_WAIT); 588 589 async = mp->mnt_flag & MNT_ASYNC; 590 mp->mnt_flag &= ~MNT_ASYNC; 591 cache_purgevfs(mp); /* remove cache entries for this file sys */ 592 if (mp->mnt_syncer != NULL) 593 vfs_deallocate_syncvnode(mp); 594 error = 0; 595 if ((mp->mnt_flag & MNT_RDONLY) == 0) { 596 #if NFSS > 0 597 error = fss_umount_hook(mp, (flags & MNT_FORCE)); 598 #endif 599 if (error == 0) 600 error = VFS_SYNC(mp, MNT_WAIT, l->l_cred, l); 601 } 602 if (error == 0 || (flags & MNT_FORCE)) 603 error = VFS_UNMOUNT(mp, flags, l); 604 vn_finished_write(mp, 0); 605 simple_lock(&mountlist_slock); 606 if (error) { 607 if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) 608 (void) vfs_allocate_syncvnode(mp); 609 mp->mnt_iflag &= ~IMNT_UNMOUNT; 610 mp->mnt_unmounter = NULL; 611 mp->mnt_flag |= async; 612 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, 613 &mountlist_slock); 614 if (used_syncer) 615 lockmgr(&syncer_lock, LK_RELEASE, NULL); 616 simple_lock(&mp->mnt_slock); 617 while (mp->mnt_wcnt > 0) { 618 wakeup(mp); 619 ltsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 620 0, &mp->mnt_slock); 621 } 622 simple_unlock(&mp->mnt_slock); 623 return (error); 624 } 625 CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); 626 if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { 627 coveredvp->v_mountedhere = NULL; 628 vrele(coveredvp); 629 } 630 mp->mnt_op->vfs_refcount--; 631 if (TAILQ_FIRST(&mp->mnt_vnodelist) != NULL) 632 panic("unmount: dangling vnode"); 633 mp->mnt_iflag |= IMNT_GONE; 634 lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); 635 mount_finispecific(mp); 636 if (used_syncer) 637 lockmgr(&syncer_lock, LK_RELEASE, NULL); 638 simple_lock(&mp->mnt_slock); 639 while (mp->mnt_wcnt > 0) { 640 wakeup(mp); 641 ltsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0, &mp->mnt_slock); 642 } 643 simple_unlock(&mp->mnt_slock); 644 vfs_hooks_unmount(mp); 645 free(mp, M_MOUNT); 646 return (0); 647 } 648 649 /* 650 * Sync each mounted filesystem. 651 */ 652 #ifdef DEBUG 653 int syncprt = 0; 654 struct ctldebug debug0 = { "syncprt", &syncprt }; 655 #endif 656 657 /* ARGSUSED */ 658 int 659 sys_sync(struct lwp *l, void *v, register_t *retval) 660 { 661 struct mount *mp, *nmp; 662 int asyncflag; 663 664 if (l == NULL) 665 l = &lwp0; 666 667 simple_lock(&mountlist_slock); 668 for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { 669 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 670 nmp = mp->mnt_list.cqe_prev; 671 continue; 672 } 673 if ((mp->mnt_flag & MNT_RDONLY) == 0 && 674 vn_start_write(NULL, &mp, V_NOWAIT) == 0) { 675 asyncflag = mp->mnt_flag & MNT_ASYNC; 676 mp->mnt_flag &= ~MNT_ASYNC; 677 VFS_SYNC(mp, MNT_NOWAIT, l->l_cred, l); 678 if (asyncflag) 679 mp->mnt_flag |= MNT_ASYNC; 680 vn_finished_write(mp, 0); 681 } 682 simple_lock(&mountlist_slock); 683 nmp = mp->mnt_list.cqe_prev; 684 vfs_unbusy(mp); 685 686 } 687 simple_unlock(&mountlist_slock); 688 #ifdef DEBUG 689 if (syncprt) 690 vfs_bufstats(); 691 #endif /* DEBUG */ 692 return (0); 693 } 694 695 /* 696 * Change filesystem quotas. 697 */ 698 /* ARGSUSED */ 699 int 700 sys_quotactl(struct lwp *l, void *v, register_t *retval) 701 { 702 struct sys_quotactl_args /* { 703 syscallarg(const char *) path; 704 syscallarg(int) cmd; 705 syscallarg(int) uid; 706 syscallarg(void *) arg; 707 } */ *uap = v; 708 struct mount *mp; 709 int error; 710 struct nameidata nd; 711 712 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 713 if ((error = namei(&nd)) != 0) 714 return (error); 715 error = vn_start_write(nd.ni_vp, &mp, V_WAIT | V_PCATCH); 716 vrele(nd.ni_vp); 717 if (error) 718 return (error); 719 error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), 720 SCARG(uap, arg), l); 721 vn_finished_write(mp, 0); 722 return (error); 723 } 724 725 int 726 dostatvfs(struct mount *mp, struct statvfs *sp, struct lwp *l, int flags, 727 int root) 728 { 729 struct cwdinfo *cwdi = l->l_proc->p_cwdi; 730 int error = 0; 731 732 /* 733 * If MNT_NOWAIT or MNT_LAZY is specified, do not 734 * refresh the fsstat cache. MNT_WAIT or MNT_LAZY 735 * overrides MNT_NOWAIT. 736 */ 737 if (flags == MNT_NOWAIT || flags == MNT_LAZY || 738 (flags != MNT_WAIT && flags != 0)) { 739 memcpy(sp, &mp->mnt_stat, sizeof(*sp)); 740 goto done; 741 } 742 743 /* Get the filesystem stats now */ 744 memset(sp, 0, sizeof(*sp)); 745 if ((error = VFS_STATVFS(mp, sp, l)) != 0) { 746 return error; 747 } 748 749 if (cwdi->cwdi_rdir == NULL) 750 (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); 751 done: 752 if (cwdi->cwdi_rdir != NULL) { 753 size_t len; 754 char *bp; 755 char *path = PNBUF_GET(); 756 if (!path) 757 return ENOMEM; 758 759 bp = path + MAXPATHLEN; 760 *--bp = '\0'; 761 error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, 762 MAXPATHLEN / 2, 0, l); 763 if (error) { 764 PNBUF_PUT(path); 765 return error; 766 } 767 len = strlen(bp); 768 /* 769 * for mount points that are below our root, we can see 770 * them, so we fix up the pathname and return them. The 771 * rest we cannot see, so we don't allow viewing the 772 * data. 773 */ 774 if (strncmp(bp, sp->f_mntonname, len) == 0) { 775 strlcpy(sp->f_mntonname, &sp->f_mntonname[len], 776 sizeof(sp->f_mntonname)); 777 if (sp->f_mntonname[0] == '\0') 778 (void)strlcpy(sp->f_mntonname, "/", 779 sizeof(sp->f_mntonname)); 780 } else { 781 if (root) 782 (void)strlcpy(sp->f_mntonname, "/", 783 sizeof(sp->f_mntonname)); 784 else 785 error = EPERM; 786 } 787 PNBUF_PUT(path); 788 } 789 sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK; 790 return error; 791 } 792 793 /* 794 * Get filesystem statistics. 795 */ 796 /* ARGSUSED */ 797 int 798 sys_statvfs1(struct lwp *l, void *v, register_t *retval) 799 { 800 struct sys_statvfs1_args /* { 801 syscallarg(const char *) path; 802 syscallarg(struct statvfs *) buf; 803 syscallarg(int) flags; 804 } */ *uap = v; 805 struct mount *mp; 806 struct statvfs *sb; 807 int error; 808 struct nameidata nd; 809 810 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 811 if ((error = namei(&nd)) != 0) 812 return error; 813 mp = nd.ni_vp->v_mount; 814 vrele(nd.ni_vp); 815 sb = STATVFSBUF_GET(); 816 error = dostatvfs(mp, sb, l, SCARG(uap, flags), 1); 817 if (error == 0) { 818 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 819 } 820 STATVFSBUF_PUT(sb); 821 return error; 822 } 823 824 /* 825 * Get filesystem statistics. 826 */ 827 /* ARGSUSED */ 828 int 829 sys_fstatvfs1(struct lwp *l, void *v, register_t *retval) 830 { 831 struct sys_fstatvfs1_args /* { 832 syscallarg(int) fd; 833 syscallarg(struct statvfs *) buf; 834 syscallarg(int) flags; 835 } */ *uap = v; 836 struct proc *p = l->l_proc; 837 struct file *fp; 838 struct mount *mp; 839 struct statvfs *sb; 840 int error; 841 842 /* getvnode() will use the descriptor for us */ 843 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 844 return (error); 845 mp = ((struct vnode *)fp->f_data)->v_mount; 846 sb = STATVFSBUF_GET(); 847 if ((error = dostatvfs(mp, sb, l, SCARG(uap, flags), 1)) != 0) 848 goto out; 849 error = copyout(sb, SCARG(uap, buf), sizeof(*sb)); 850 out: 851 FILE_UNUSE(fp, l); 852 STATVFSBUF_PUT(sb); 853 return error; 854 } 855 856 857 /* 858 * Get statistics on all filesystems. 859 */ 860 int 861 sys_getvfsstat(struct lwp *l, void *v, register_t *retval) 862 { 863 struct sys_getvfsstat_args /* { 864 syscallarg(struct statvfs *) buf; 865 syscallarg(size_t) bufsize; 866 syscallarg(int) flags; 867 } */ *uap = v; 868 int root = 0; 869 struct proc *p = l->l_proc; 870 struct mount *mp, *nmp; 871 struct statvfs *sb; 872 struct statvfs *sfsp; 873 size_t count, maxcount; 874 int error = 0; 875 876 sb = STATVFSBUF_GET(); 877 maxcount = SCARG(uap, bufsize) / sizeof(struct statvfs); 878 sfsp = SCARG(uap, buf); 879 simple_lock(&mountlist_slock); 880 count = 0; 881 for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; 882 mp = nmp) { 883 if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { 884 nmp = CIRCLEQ_NEXT(mp, mnt_list); 885 continue; 886 } 887 if (sfsp && count < maxcount) { 888 error = dostatvfs(mp, sb, l, SCARG(uap, flags), 0); 889 if (error) { 890 simple_lock(&mountlist_slock); 891 nmp = CIRCLEQ_NEXT(mp, mnt_list); 892 vfs_unbusy(mp); 893 continue; 894 } 895 error = copyout(sb, sfsp, sizeof(*sfsp)); 896 if (error) { 897 vfs_unbusy(mp); 898 goto out; 899 } 900 sfsp++; 901 root |= strcmp(sb->f_mntonname, "/") == 0; 902 } 903 count++; 904 simple_lock(&mountlist_slock); 905 nmp = CIRCLEQ_NEXT(mp, mnt_list); 906 vfs_unbusy(mp); 907 } 908 simple_unlock(&mountlist_slock); 909 if (root == 0 && p->p_cwdi->cwdi_rdir) { 910 /* 911 * fake a root entry 912 */ 913 if ((error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount, sb, l, 914 SCARG(uap, flags), 1)) != 0) 915 goto out; 916 if (sfsp) 917 error = copyout(sb, sfsp, sizeof(*sfsp)); 918 count++; 919 } 920 if (sfsp && count > maxcount) 921 *retval = maxcount; 922 else 923 *retval = count; 924 out: 925 STATVFSBUF_PUT(sb); 926 return error; 927 } 928 929 /* 930 * Change current working directory to a given file descriptor. 931 */ 932 /* ARGSUSED */ 933 int 934 sys_fchdir(struct lwp *l, void *v, register_t *retval) 935 { 936 struct sys_fchdir_args /* { 937 syscallarg(int) fd; 938 } */ *uap = v; 939 struct proc *p = l->l_proc; 940 struct filedesc *fdp = p->p_fd; 941 struct cwdinfo *cwdi = p->p_cwdi; 942 struct vnode *vp, *tdp; 943 struct mount *mp; 944 struct file *fp; 945 int error; 946 947 /* getvnode() will use the descriptor for us */ 948 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 949 return (error); 950 vp = (struct vnode *)fp->f_data; 951 952 VREF(vp); 953 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 954 if (vp->v_type != VDIR) 955 error = ENOTDIR; 956 else 957 error = VOP_ACCESS(vp, VEXEC, l->l_cred, l); 958 if (error) { 959 vput(vp); 960 goto out; 961 } 962 while (!error && (mp = vp->v_mountedhere) != NULL) { 963 if (vfs_busy(mp, 0, 0)) 964 continue; 965 966 vput(vp); 967 error = VFS_ROOT(mp, &tdp); 968 vfs_unbusy(mp); 969 if (error) 970 goto out; 971 vp = tdp; 972 } 973 VOP_UNLOCK(vp, 0); 974 975 /* 976 * Disallow changing to a directory not under the process's 977 * current root directory (if there is one). 978 */ 979 if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, l)) { 980 vrele(vp); 981 error = EPERM; /* operation not permitted */ 982 goto out; 983 } 984 985 vrele(cwdi->cwdi_cdir); 986 cwdi->cwdi_cdir = vp; 987 out: 988 FILE_UNUSE(fp, l); 989 return (error); 990 } 991 992 /* 993 * Change this process's notion of the root directory to a given file 994 * descriptor. 995 */ 996 int 997 sys_fchroot(struct lwp *l, void *v, register_t *retval) 998 { 999 struct sys_fchroot_args *uap = v; 1000 struct proc *p = l->l_proc; 1001 struct filedesc *fdp = p->p_fd; 1002 struct cwdinfo *cwdi = p->p_cwdi; 1003 struct vnode *vp; 1004 struct file *fp; 1005 int error; 1006 1007 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1008 KAUTH_REQ_SYSTEM_CHROOT_FCHROOT, NULL, NULL, NULL)) != 0) 1009 return error; 1010 /* getvnode() will use the descriptor for us */ 1011 if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) 1012 return error; 1013 vp = (struct vnode *) fp->f_data; 1014 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1015 if (vp->v_type != VDIR) 1016 error = ENOTDIR; 1017 else 1018 error = VOP_ACCESS(vp, VEXEC, l->l_cred, l); 1019 VOP_UNLOCK(vp, 0); 1020 if (error) 1021 goto out; 1022 VREF(vp); 1023 1024 /* 1025 * Prevent escaping from chroot by putting the root under 1026 * the working directory. Silently chdir to / if we aren't 1027 * already there. 1028 */ 1029 if (!vn_isunder(cwdi->cwdi_cdir, vp, l)) { 1030 /* 1031 * XXX would be more failsafe to change directory to a 1032 * deadfs node here instead 1033 */ 1034 vrele(cwdi->cwdi_cdir); 1035 VREF(vp); 1036 cwdi->cwdi_cdir = vp; 1037 } 1038 1039 if (cwdi->cwdi_rdir != NULL) 1040 vrele(cwdi->cwdi_rdir); 1041 cwdi->cwdi_rdir = vp; 1042 out: 1043 FILE_UNUSE(fp, l); 1044 return (error); 1045 } 1046 1047 /* 1048 * Change current working directory (``.''). 1049 */ 1050 /* ARGSUSED */ 1051 int 1052 sys_chdir(struct lwp *l, void *v, register_t *retval) 1053 { 1054 struct sys_chdir_args /* { 1055 syscallarg(const char *) path; 1056 } */ *uap = v; 1057 struct proc *p = l->l_proc; 1058 struct cwdinfo *cwdi = p->p_cwdi; 1059 int error; 1060 struct nameidata nd; 1061 1062 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1063 SCARG(uap, path), l); 1064 if ((error = change_dir(&nd, l)) != 0) 1065 return (error); 1066 vrele(cwdi->cwdi_cdir); 1067 cwdi->cwdi_cdir = nd.ni_vp; 1068 return (0); 1069 } 1070 1071 /* 1072 * Change notion of root (``/'') directory. 1073 */ 1074 /* ARGSUSED */ 1075 int 1076 sys_chroot(struct lwp *l, void *v, register_t *retval) 1077 { 1078 struct sys_chroot_args /* { 1079 syscallarg(const char *) path; 1080 } */ *uap = v; 1081 struct proc *p = l->l_proc; 1082 struct cwdinfo *cwdi = p->p_cwdi; 1083 struct vnode *vp; 1084 int error; 1085 struct nameidata nd; 1086 1087 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_CHROOT, 1088 KAUTH_REQ_SYSTEM_CHROOT_CHROOT, NULL, NULL, NULL)) != 0) 1089 return (error); 1090 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1091 SCARG(uap, path), l); 1092 if ((error = change_dir(&nd, l)) != 0) 1093 return (error); 1094 if (cwdi->cwdi_rdir != NULL) 1095 vrele(cwdi->cwdi_rdir); 1096 vp = nd.ni_vp; 1097 cwdi->cwdi_rdir = vp; 1098 1099 /* 1100 * Prevent escaping from chroot by putting the root under 1101 * the working directory. Silently chdir to / if we aren't 1102 * already there. 1103 */ 1104 if (!vn_isunder(cwdi->cwdi_cdir, vp, l)) { 1105 /* 1106 * XXX would be more failsafe to change directory to a 1107 * deadfs node here instead 1108 */ 1109 vrele(cwdi->cwdi_cdir); 1110 VREF(vp); 1111 cwdi->cwdi_cdir = vp; 1112 } 1113 1114 return (0); 1115 } 1116 1117 /* 1118 * Common routine for chroot and chdir. 1119 */ 1120 static int 1121 change_dir(struct nameidata *ndp, struct lwp *l) 1122 { 1123 struct vnode *vp; 1124 int error; 1125 1126 if ((error = namei(ndp)) != 0) 1127 return (error); 1128 vp = ndp->ni_vp; 1129 if (vp->v_type != VDIR) 1130 error = ENOTDIR; 1131 else 1132 error = VOP_ACCESS(vp, VEXEC, l->l_cred, l); 1133 1134 if (error) 1135 vput(vp); 1136 else 1137 VOP_UNLOCK(vp, 0); 1138 return (error); 1139 } 1140 1141 /* 1142 * Check permissions, allocate an open file structure, 1143 * and call the device open routine if any. 1144 */ 1145 int 1146 sys_open(struct lwp *l, void *v, register_t *retval) 1147 { 1148 struct sys_open_args /* { 1149 syscallarg(const char *) path; 1150 syscallarg(int) flags; 1151 syscallarg(int) mode; 1152 } */ *uap = v; 1153 struct proc *p = l->l_proc; 1154 struct cwdinfo *cwdi = p->p_cwdi; 1155 struct filedesc *fdp = p->p_fd; 1156 struct file *fp; 1157 struct vnode *vp; 1158 int flags, cmode; 1159 int type, indx, error; 1160 struct flock lf; 1161 struct nameidata nd; 1162 1163 flags = FFLAGS(SCARG(uap, flags)); 1164 if ((flags & (FREAD | FWRITE)) == 0) 1165 return (EINVAL); 1166 /* falloc() will use the file descriptor for us */ 1167 if ((error = falloc(l, &fp, &indx)) != 0) 1168 return (error); 1169 cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; 1170 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 1171 l->l_dupfd = -indx - 1; /* XXX check for fdopen */ 1172 if ((error = vn_open(&nd, flags, cmode)) != 0) { 1173 FILE_UNUSE(fp, l); 1174 fdp->fd_ofiles[indx] = NULL; 1175 ffree(fp); 1176 if ((error == EDUPFD || error == EMOVEFD) && 1177 l->l_dupfd >= 0 && /* XXX from fdopen */ 1178 (error = 1179 dupfdopen(l, indx, l->l_dupfd, flags, error)) == 0) { 1180 *retval = indx; 1181 return (0); 1182 } 1183 if (error == ERESTART) 1184 error = EINTR; 1185 fdremove(fdp, indx); 1186 return (error); 1187 } 1188 l->l_dupfd = 0; 1189 vp = nd.ni_vp; 1190 fp->f_flag = flags & FMASK; 1191 fp->f_type = DTYPE_VNODE; 1192 fp->f_ops = &vnops; 1193 fp->f_data = vp; 1194 if (flags & (O_EXLOCK | O_SHLOCK)) { 1195 lf.l_whence = SEEK_SET; 1196 lf.l_start = 0; 1197 lf.l_len = 0; 1198 if (flags & O_EXLOCK) 1199 lf.l_type = F_WRLCK; 1200 else 1201 lf.l_type = F_RDLCK; 1202 type = F_FLOCK; 1203 if ((flags & FNONBLOCK) == 0) 1204 type |= F_WAIT; 1205 VOP_UNLOCK(vp, 0); 1206 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1207 if (error) { 1208 (void) vn_close(vp, fp->f_flag, fp->f_cred, l); 1209 FILE_UNUSE(fp, l); 1210 ffree(fp); 1211 fdremove(fdp, indx); 1212 return (error); 1213 } 1214 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1215 fp->f_flag |= FHASLOCK; 1216 } 1217 VOP_UNLOCK(vp, 0); 1218 *retval = indx; 1219 FILE_SET_MATURE(fp); 1220 FILE_UNUSE(fp, l); 1221 return (0); 1222 } 1223 1224 static void 1225 vfs__fhfree(fhandle_t *fhp) 1226 { 1227 size_t fhsize; 1228 1229 if (fhp == NULL) { 1230 return; 1231 } 1232 fhsize = FHANDLE_SIZE(fhp); 1233 kmem_free(fhp, fhsize); 1234 } 1235 1236 /* 1237 * vfs_composefh: compose a filehandle. 1238 */ 1239 1240 int 1241 vfs_composefh(struct vnode *vp, fhandle_t *fhp, size_t *fh_size) 1242 { 1243 struct mount *mp; 1244 struct fid *fidp; 1245 int error; 1246 size_t needfhsize; 1247 size_t fidsize; 1248 1249 mp = vp->v_mount; 1250 fidp = NULL; 1251 if (*fh_size < FHANDLE_SIZE_MIN) { 1252 fidsize = 0; 1253 } else { 1254 fidsize = *fh_size - offsetof(fhandle_t, fh_fid); 1255 if (fhp != NULL) { 1256 memset(fhp, 0, *fh_size); 1257 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1258 fidp = &fhp->fh_fid; 1259 } 1260 } 1261 error = VFS_VPTOFH(vp, fidp, &fidsize); 1262 needfhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1263 if (error == 0 && *fh_size < needfhsize) { 1264 error = E2BIG; 1265 } 1266 *fh_size = needfhsize; 1267 return error; 1268 } 1269 1270 int 1271 vfs_composefh_alloc(struct vnode *vp, fhandle_t **fhpp) 1272 { 1273 struct mount *mp; 1274 fhandle_t *fhp; 1275 size_t fhsize; 1276 size_t fidsize; 1277 int error; 1278 1279 *fhpp = NULL; 1280 mp = vp->v_mount; 1281 fidsize = 0; 1282 error = VFS_VPTOFH(vp, NULL, &fidsize); 1283 KASSERT(error != 0); 1284 if (error != E2BIG) { 1285 goto out; 1286 } 1287 fhsize = FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize); 1288 fhp = kmem_zalloc(fhsize, KM_SLEEP); 1289 if (fhp == NULL) { 1290 error = ENOMEM; 1291 goto out; 1292 } 1293 fhp->fh_fsid = mp->mnt_stat.f_fsidx; 1294 error = VFS_VPTOFH(vp, &fhp->fh_fid, &fidsize); 1295 if (error == 0) { 1296 KASSERT((FHANDLE_SIZE(fhp) == fhsize && 1297 FHANDLE_FILEID(fhp)->fid_len == fidsize)); 1298 *fhpp = fhp; 1299 } else { 1300 kmem_free(fhp, fhsize); 1301 } 1302 out: 1303 return error; 1304 } 1305 1306 void 1307 vfs_composefh_free(fhandle_t *fhp) 1308 { 1309 1310 vfs__fhfree(fhp); 1311 } 1312 1313 /* 1314 * vfs_fhtovp: lookup a vnode by a filehandle. 1315 */ 1316 1317 int 1318 vfs_fhtovp(fhandle_t *fhp, struct vnode **vpp) 1319 { 1320 struct mount *mp; 1321 int error; 1322 1323 *vpp = NULL; 1324 mp = vfs_getvfs(FHANDLE_FSID(fhp)); 1325 if (mp == NULL) { 1326 error = ESTALE; 1327 goto out; 1328 } 1329 if (mp->mnt_op->vfs_fhtovp == NULL) { 1330 error = EOPNOTSUPP; 1331 goto out; 1332 } 1333 error = VFS_FHTOVP(mp, FHANDLE_FILEID(fhp), vpp); 1334 out: 1335 return error; 1336 } 1337 1338 /* 1339 * vfs_copyinfh_alloc: allocate and copyin a filehandle, given 1340 * the needed size. 1341 */ 1342 1343 int 1344 vfs_copyinfh_alloc(const void *ufhp, size_t fhsize, fhandle_t **fhpp) 1345 { 1346 fhandle_t *fhp; 1347 int error; 1348 1349 *fhpp = NULL; 1350 if (fhsize > FHANDLE_SIZE_MAX) { 1351 return EINVAL; 1352 } 1353 if (fhsize < FHANDLE_SIZE_MIN) { 1354 return EINVAL; 1355 } 1356 again: 1357 fhp = kmem_alloc(fhsize, KM_SLEEP); 1358 if (fhp == NULL) { 1359 return ENOMEM; 1360 } 1361 error = copyin(ufhp, fhp, fhsize); 1362 if (error == 0) { 1363 /* XXX this check shouldn't be here */ 1364 if (FHANDLE_SIZE(fhp) == fhsize) { 1365 *fhpp = fhp; 1366 return 0; 1367 } else if (fhsize == NFSX_V2FH && FHANDLE_SIZE(fhp) < fhsize) { 1368 /* 1369 * a kludge for nfsv2 padded handles. 1370 */ 1371 size_t sz; 1372 1373 sz = FHANDLE_SIZE(fhp); 1374 kmem_free(fhp, fhsize); 1375 fhsize = sz; 1376 goto again; 1377 } else { 1378 /* 1379 * userland told us wrong size. 1380 */ 1381 error = EINVAL; 1382 } 1383 } 1384 kmem_free(fhp, fhsize); 1385 return error; 1386 } 1387 1388 void 1389 vfs_copyinfh_free(fhandle_t *fhp) 1390 { 1391 1392 vfs__fhfree(fhp); 1393 } 1394 1395 /* 1396 * Get file handle system call 1397 */ 1398 int 1399 sys___getfh30(struct lwp *l, void *v, register_t *retval) 1400 { 1401 struct sys___getfh30_args /* { 1402 syscallarg(char *) fname; 1403 syscallarg(fhandle_t *) fhp; 1404 syscallarg(size_t *) fh_size; 1405 } */ *uap = v; 1406 struct vnode *vp; 1407 fhandle_t *fh; 1408 int error; 1409 struct nameidata nd; 1410 size_t sz; 1411 size_t usz; 1412 1413 /* 1414 * Must be super user 1415 */ 1416 error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1417 0, NULL, NULL, NULL); 1418 if (error) 1419 return (error); 1420 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 1421 SCARG(uap, fname), l); 1422 error = namei(&nd); 1423 if (error) 1424 return (error); 1425 vp = nd.ni_vp; 1426 error = vfs_composefh_alloc(vp, &fh); 1427 vput(vp); 1428 if (error != 0) { 1429 goto out; 1430 } 1431 error = copyin(SCARG(uap, fh_size), &usz, sizeof(size_t)); 1432 if (error != 0) { 1433 goto out; 1434 } 1435 sz = FHANDLE_SIZE(fh); 1436 error = copyout(&sz, SCARG(uap, fh_size), sizeof(size_t)); 1437 if (error != 0) { 1438 goto out; 1439 } 1440 if (usz >= sz) { 1441 error = copyout(fh, SCARG(uap, fhp), sz); 1442 } else { 1443 error = E2BIG; 1444 } 1445 out: 1446 vfs_composefh_free(fh); 1447 return (error); 1448 } 1449 1450 /* 1451 * Open a file given a file handle. 1452 * 1453 * Check permissions, allocate an open file structure, 1454 * and call the device open routine if any. 1455 */ 1456 1457 int 1458 dofhopen(struct lwp *l, const void *ufhp, size_t fhsize, int oflags, 1459 register_t *retval) 1460 { 1461 struct filedesc *fdp = l->l_proc->p_fd; 1462 struct file *fp; 1463 struct vnode *vp = NULL; 1464 struct mount *mp; 1465 kauth_cred_t cred = l->l_cred; 1466 struct file *nfp; 1467 int type, indx, error=0; 1468 struct flock lf; 1469 struct vattr va; 1470 fhandle_t *fh; 1471 int flags; 1472 1473 /* 1474 * Must be super user 1475 */ 1476 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1477 0, NULL, NULL, NULL))) 1478 return (error); 1479 1480 flags = FFLAGS(oflags); 1481 if ((flags & (FREAD | FWRITE)) == 0) 1482 return (EINVAL); 1483 if ((flags & O_CREAT)) 1484 return (EINVAL); 1485 /* falloc() will use the file descriptor for us */ 1486 if ((error = falloc(l, &nfp, &indx)) != 0) 1487 return (error); 1488 fp = nfp; 1489 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1490 if (error != 0) { 1491 goto bad; 1492 } 1493 error = vfs_fhtovp(fh, &vp); 1494 if (error != 0) { 1495 goto bad; 1496 } 1497 1498 /* Now do an effective vn_open */ 1499 1500 if (vp->v_type == VSOCK) { 1501 error = EOPNOTSUPP; 1502 goto bad; 1503 } 1504 if (flags & FREAD) { 1505 if ((error = VOP_ACCESS(vp, VREAD, cred, l)) != 0) 1506 goto bad; 1507 } 1508 if (flags & (FWRITE | O_TRUNC)) { 1509 if (vp->v_type == VDIR) { 1510 error = EISDIR; 1511 goto bad; 1512 } 1513 if ((error = vn_writechk(vp)) != 0 || 1514 (error = VOP_ACCESS(vp, VWRITE, cred, l)) != 0) 1515 goto bad; 1516 } 1517 if (flags & O_TRUNC) { 1518 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 1519 goto bad; 1520 VOP_UNLOCK(vp, 0); /* XXX */ 1521 VOP_LEASE(vp, l, cred, LEASE_WRITE); 1522 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ 1523 VATTR_NULL(&va); 1524 va.va_size = 0; 1525 error = VOP_SETATTR(vp, &va, cred, l); 1526 vn_finished_write(mp, 0); 1527 if (error) 1528 goto bad; 1529 } 1530 if ((error = VOP_OPEN(vp, flags, cred, l)) != 0) 1531 goto bad; 1532 if (vp->v_type == VREG && 1533 uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { 1534 error = EIO; 1535 goto bad; 1536 } 1537 if (flags & FWRITE) 1538 vp->v_writecount++; 1539 1540 /* done with modified vn_open, now finish what sys_open does. */ 1541 1542 fp->f_flag = flags & FMASK; 1543 fp->f_type = DTYPE_VNODE; 1544 fp->f_ops = &vnops; 1545 fp->f_data = vp; 1546 if (flags & (O_EXLOCK | O_SHLOCK)) { 1547 lf.l_whence = SEEK_SET; 1548 lf.l_start = 0; 1549 lf.l_len = 0; 1550 if (flags & O_EXLOCK) 1551 lf.l_type = F_WRLCK; 1552 else 1553 lf.l_type = F_RDLCK; 1554 type = F_FLOCK; 1555 if ((flags & FNONBLOCK) == 0) 1556 type |= F_WAIT; 1557 VOP_UNLOCK(vp, 0); 1558 error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); 1559 if (error) { 1560 (void) vn_close(vp, fp->f_flag, fp->f_cred, l); 1561 FILE_UNUSE(fp, l); 1562 ffree(fp); 1563 fdremove(fdp, indx); 1564 return (error); 1565 } 1566 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1567 fp->f_flag |= FHASLOCK; 1568 } 1569 VOP_UNLOCK(vp, 0); 1570 *retval = indx; 1571 FILE_SET_MATURE(fp); 1572 FILE_UNUSE(fp, l); 1573 vfs_copyinfh_free(fh); 1574 return (0); 1575 1576 bad: 1577 FILE_UNUSE(fp, l); 1578 ffree(fp); 1579 fdremove(fdp, indx); 1580 if (vp != NULL) 1581 vput(vp); 1582 vfs_copyinfh_free(fh); 1583 return (error); 1584 } 1585 1586 int 1587 sys___fhopen40(struct lwp *l, void *v, register_t *retval) 1588 { 1589 struct sys___fhopen40_args /* { 1590 syscallarg(const void *) fhp; 1591 syscallarg(size_t) fh_size; 1592 syscallarg(int) flags; 1593 } */ *uap = v; 1594 1595 return dofhopen(l, SCARG(uap, fhp), SCARG(uap, fh_size), 1596 SCARG(uap, flags), retval); 1597 } 1598 1599 int 1600 dofhstat(struct lwp *l, const void *ufhp, size_t fhsize, struct stat *sbp, 1601 register_t *retval) 1602 { 1603 struct stat sb; 1604 int error; 1605 fhandle_t *fh; 1606 struct vnode *vp; 1607 1608 /* 1609 * Must be super user 1610 */ 1611 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1612 0, NULL, NULL, NULL))) 1613 return (error); 1614 1615 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1616 if (error != 0) { 1617 goto bad; 1618 } 1619 error = vfs_fhtovp(fh, &vp); 1620 if (error != 0) { 1621 goto bad; 1622 } 1623 error = vn_stat(vp, &sb, l); 1624 vput(vp); 1625 if (error) { 1626 goto bad; 1627 } 1628 error = copyout(&sb, sbp, sizeof(sb)); 1629 bad: 1630 vfs_copyinfh_free(fh); 1631 return error; 1632 } 1633 1634 1635 /* ARGSUSED */ 1636 int 1637 sys___fhstat40(struct lwp *l, void *v, register_t *retval) 1638 { 1639 struct sys___fhstat40_args /* { 1640 syscallarg(const void *) fhp; 1641 syscallarg(size_t) fh_size; 1642 syscallarg(struct stat *) sb; 1643 } */ *uap = v; 1644 1645 return dofhstat(l, SCARG(uap, fhp), SCARG(uap, fh_size), SCARG(uap, sb), 1646 retval); 1647 } 1648 1649 int 1650 dofhstatvfs(struct lwp *l, const void *ufhp, size_t fhsize, struct statvfs *buf, 1651 int flags, register_t *retval) 1652 { 1653 struct statvfs *sb = NULL; 1654 fhandle_t *fh; 1655 struct mount *mp; 1656 struct vnode *vp; 1657 int error; 1658 1659 /* 1660 * Must be super user 1661 */ 1662 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FILEHANDLE, 1663 0, NULL, NULL, NULL))) 1664 return error; 1665 1666 error = vfs_copyinfh_alloc(ufhp, fhsize, &fh); 1667 if (error != 0) { 1668 goto out; 1669 } 1670 error = vfs_fhtovp(fh, &vp); 1671 if (error != 0) { 1672 goto out; 1673 } 1674 mp = vp->v_mount; 1675 sb = STATVFSBUF_GET(); 1676 if ((error = dostatvfs(mp, sb, l, flags, 1)) != 0) { 1677 vput(vp); 1678 goto out; 1679 } 1680 vput(vp); 1681 error = copyout(sb, buf, sizeof(*sb)); 1682 out: 1683 if (sb != NULL) { 1684 STATVFSBUF_PUT(sb); 1685 } 1686 vfs_copyinfh_free(fh); 1687 return error; 1688 } 1689 1690 /* ARGSUSED */ 1691 int 1692 sys___fhstatvfs140(struct lwp *l, void *v, register_t *retval) 1693 { 1694 struct sys___fhstatvfs140_args /* { 1695 syscallarg(const void *) fhp; 1696 syscallarg(size_t) fh_size; 1697 syscallarg(struct statvfs *) buf; 1698 syscallarg(int) flags; 1699 } */ *uap = v; 1700 1701 return dofhstatvfs(l, SCARG(uap, fhp), SCARG(uap, fh_size), 1702 SCARG(uap, buf), SCARG(uap, flags), retval); 1703 } 1704 1705 /* 1706 * Create a special file. 1707 */ 1708 /* ARGSUSED */ 1709 int 1710 sys_mknod(struct lwp *l, void *v, register_t *retval) 1711 { 1712 struct sys_mknod_args /* { 1713 syscallarg(const char *) path; 1714 syscallarg(int) mode; 1715 syscallarg(int) dev; 1716 } */ *uap = v; 1717 struct proc *p = l->l_proc; 1718 struct vnode *vp; 1719 struct mount *mp; 1720 struct vattr vattr; 1721 int error; 1722 int whiteout = 0; 1723 struct nameidata nd; 1724 1725 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MKNOD, 1726 0, NULL, NULL, NULL)) != 0) 1727 return (error); 1728 restart: 1729 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), l); 1730 if ((error = namei(&nd)) != 0) 1731 return (error); 1732 vp = nd.ni_vp; 1733 if (vp != NULL) 1734 error = EEXIST; 1735 else { 1736 VATTR_NULL(&vattr); 1737 vattr.va_mode = 1738 (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1739 vattr.va_rdev = SCARG(uap, dev); 1740 whiteout = 0; 1741 1742 switch (SCARG(uap, mode) & S_IFMT) { 1743 case S_IFMT: /* used by badsect to flag bad sectors */ 1744 vattr.va_type = VBAD; 1745 break; 1746 case S_IFCHR: 1747 vattr.va_type = VCHR; 1748 break; 1749 case S_IFBLK: 1750 vattr.va_type = VBLK; 1751 break; 1752 case S_IFWHT: 1753 whiteout = 1; 1754 break; 1755 default: 1756 error = EINVAL; 1757 break; 1758 } 1759 } 1760 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1761 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1762 if (nd.ni_dvp == vp) 1763 vrele(nd.ni_dvp); 1764 else 1765 vput(nd.ni_dvp); 1766 if (vp) 1767 vrele(vp); 1768 if ((error = vn_start_write(NULL, &mp, 1769 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1770 return (error); 1771 goto restart; 1772 } 1773 if (!error) { 1774 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 1775 if (whiteout) { 1776 error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); 1777 if (error) 1778 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1779 vput(nd.ni_dvp); 1780 } else { 1781 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, 1782 &nd.ni_cnd, &vattr); 1783 if (error == 0) 1784 vput(nd.ni_vp); 1785 } 1786 } else { 1787 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1788 if (nd.ni_dvp == vp) 1789 vrele(nd.ni_dvp); 1790 else 1791 vput(nd.ni_dvp); 1792 if (vp) 1793 vrele(vp); 1794 } 1795 vn_finished_write(mp, 0); 1796 return (error); 1797 } 1798 1799 /* 1800 * Create a named pipe. 1801 */ 1802 /* ARGSUSED */ 1803 int 1804 sys_mkfifo(struct lwp *l, void *v, register_t *retval) 1805 { 1806 struct sys_mkfifo_args /* { 1807 syscallarg(const char *) path; 1808 syscallarg(int) mode; 1809 } */ *uap = v; 1810 struct proc *p = l->l_proc; 1811 struct mount *mp; 1812 struct vattr vattr; 1813 int error; 1814 struct nameidata nd; 1815 1816 restart: 1817 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), l); 1818 if ((error = namei(&nd)) != 0) 1819 return (error); 1820 if (nd.ni_vp != NULL) { 1821 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1822 if (nd.ni_dvp == nd.ni_vp) 1823 vrele(nd.ni_dvp); 1824 else 1825 vput(nd.ni_dvp); 1826 vrele(nd.ni_vp); 1827 return (EEXIST); 1828 } 1829 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1830 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1831 if (nd.ni_dvp == nd.ni_vp) 1832 vrele(nd.ni_dvp); 1833 else 1834 vput(nd.ni_dvp); 1835 if (nd.ni_vp) 1836 vrele(nd.ni_vp); 1837 if ((error = vn_start_write(NULL, &mp, 1838 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1839 return (error); 1840 goto restart; 1841 } 1842 VATTR_NULL(&vattr); 1843 vattr.va_type = VFIFO; 1844 vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; 1845 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 1846 error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 1847 if (error == 0) 1848 vput(nd.ni_vp); 1849 vn_finished_write(mp, 0); 1850 return (error); 1851 } 1852 1853 /* 1854 * Make a hard file link. 1855 */ 1856 /* ARGSUSED */ 1857 int 1858 sys_link(struct lwp *l, void *v, register_t *retval) 1859 { 1860 struct sys_link_args /* { 1861 syscallarg(const char *) path; 1862 syscallarg(const char *) link; 1863 } */ *uap = v; 1864 struct vnode *vp; 1865 struct mount *mp; 1866 struct nameidata nd; 1867 int error; 1868 1869 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 1870 if ((error = namei(&nd)) != 0) 1871 return (error); 1872 vp = nd.ni_vp; 1873 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 1874 vrele(vp); 1875 return (error); 1876 } 1877 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), l); 1878 if ((error = namei(&nd)) != 0) 1879 goto out; 1880 if (nd.ni_vp) { 1881 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1882 if (nd.ni_dvp == nd.ni_vp) 1883 vrele(nd.ni_dvp); 1884 else 1885 vput(nd.ni_dvp); 1886 vrele(nd.ni_vp); 1887 error = EEXIST; 1888 goto out; 1889 } 1890 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 1891 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 1892 error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); 1893 out: 1894 vrele(vp); 1895 vn_finished_write(mp, 0); 1896 return (error); 1897 } 1898 1899 /* 1900 * Make a symbolic link. 1901 */ 1902 /* ARGSUSED */ 1903 int 1904 sys_symlink(struct lwp *l, void *v, register_t *retval) 1905 { 1906 struct sys_symlink_args /* { 1907 syscallarg(const char *) path; 1908 syscallarg(const char *) link; 1909 } */ *uap = v; 1910 struct proc *p = l->l_proc; 1911 struct mount *mp; 1912 struct vattr vattr; 1913 char *path; 1914 int error; 1915 struct nameidata nd; 1916 1917 path = PNBUF_GET(); 1918 error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); 1919 if (error) 1920 goto out; 1921 restart: 1922 NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), l); 1923 if ((error = namei(&nd)) != 0) 1924 goto out; 1925 if (nd.ni_vp) { 1926 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1927 if (nd.ni_dvp == nd.ni_vp) 1928 vrele(nd.ni_dvp); 1929 else 1930 vput(nd.ni_dvp); 1931 vrele(nd.ni_vp); 1932 error = EEXIST; 1933 goto out; 1934 } 1935 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1936 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1937 if (nd.ni_dvp == nd.ni_vp) 1938 vrele(nd.ni_dvp); 1939 else 1940 vput(nd.ni_dvp); 1941 if ((error = vn_start_write(NULL, &mp, 1942 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1943 return (error); 1944 goto restart; 1945 } 1946 VATTR_NULL(&vattr); 1947 vattr.va_type = VLNK; 1948 vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; 1949 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 1950 error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); 1951 if (error == 0) 1952 vput(nd.ni_vp); 1953 vn_finished_write(mp, 0); 1954 out: 1955 PNBUF_PUT(path); 1956 return (error); 1957 } 1958 1959 /* 1960 * Delete a whiteout from the filesystem. 1961 */ 1962 /* ARGSUSED */ 1963 int 1964 sys_undelete(struct lwp *l, void *v, register_t *retval) 1965 { 1966 struct sys_undelete_args /* { 1967 syscallarg(const char *) path; 1968 } */ *uap = v; 1969 int error; 1970 struct mount *mp; 1971 struct nameidata nd; 1972 1973 restart: 1974 NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, 1975 SCARG(uap, path), l); 1976 error = namei(&nd); 1977 if (error) 1978 return (error); 1979 1980 if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { 1981 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1982 if (nd.ni_dvp == nd.ni_vp) 1983 vrele(nd.ni_dvp); 1984 else 1985 vput(nd.ni_dvp); 1986 if (nd.ni_vp) 1987 vrele(nd.ni_vp); 1988 return (EEXIST); 1989 } 1990 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 1991 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 1992 if (nd.ni_dvp == nd.ni_vp) 1993 vrele(nd.ni_dvp); 1994 else 1995 vput(nd.ni_dvp); 1996 if ((error = vn_start_write(NULL, &mp, 1997 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 1998 return (error); 1999 goto restart; 2000 } 2001 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 2002 if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) 2003 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2004 vput(nd.ni_dvp); 2005 vn_finished_write(mp, 0); 2006 return (error); 2007 } 2008 2009 /* 2010 * Delete a name from the filesystem. 2011 */ 2012 /* ARGSUSED */ 2013 int 2014 sys_unlink(struct lwp *l, void *v, register_t *retval) 2015 { 2016 struct sys_unlink_args /* { 2017 syscallarg(const char *) path; 2018 } */ *uap = v; 2019 struct mount *mp; 2020 struct vnode *vp; 2021 int error; 2022 struct nameidata nd; 2023 #if NVERIEXEC > 0 2024 pathname_t pathbuf = NULL; 2025 #endif /* NVERIEXEC > 0 */ 2026 2027 restart: 2028 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 2029 SCARG(uap, path), l); 2030 if ((error = namei(&nd)) != 0) 2031 return (error); 2032 vp = nd.ni_vp; 2033 2034 /* 2035 * The root of a mounted filesystem cannot be deleted. 2036 */ 2037 if (vp->v_flag & VROOT) { 2038 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2039 if (nd.ni_dvp == vp) 2040 vrele(nd.ni_dvp); 2041 else 2042 vput(nd.ni_dvp); 2043 vput(vp); 2044 error = EBUSY; 2045 goto out; 2046 } 2047 2048 #if NVERIEXEC > 0 2049 error = pathname_get(nd.ni_dirp, nd.ni_segflg, &pathbuf); 2050 2051 /* Handle remove requests for veriexec entries. */ 2052 if (!error) { 2053 error = veriexec_removechk(vp, pathname_path(pathbuf), l); 2054 pathname_put(pathbuf); 2055 } 2056 2057 if (error) { 2058 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2059 if (nd.ni_dvp == vp) 2060 vrele(nd.ni_dvp); 2061 else 2062 vput(nd.ni_dvp); 2063 vput(vp); 2064 goto out; 2065 } 2066 #endif /* NVERIEXEC > 0 */ 2067 2068 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 2069 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 2070 if (nd.ni_dvp == vp) 2071 vrele(nd.ni_dvp); 2072 else 2073 vput(nd.ni_dvp); 2074 vput(vp); 2075 if ((error = vn_start_write(NULL, &mp, 2076 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 2077 return (error); 2078 goto restart; 2079 } 2080 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 2081 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 2082 #ifdef FILEASSOC 2083 (void)fileassoc_file_delete(vp); 2084 #endif /* FILEASSOC */ 2085 error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 2086 vn_finished_write(mp, 0); 2087 out: 2088 return (error); 2089 } 2090 2091 /* 2092 * Reposition read/write file offset. 2093 */ 2094 int 2095 sys_lseek(struct lwp *l, void *v, register_t *retval) 2096 { 2097 struct sys_lseek_args /* { 2098 syscallarg(int) fd; 2099 syscallarg(int) pad; 2100 syscallarg(off_t) offset; 2101 syscallarg(int) whence; 2102 } */ *uap = v; 2103 struct proc *p = l->l_proc; 2104 kauth_cred_t cred = l->l_cred; 2105 struct filedesc *fdp = p->p_fd; 2106 struct file *fp; 2107 struct vnode *vp; 2108 struct vattr vattr; 2109 off_t newoff; 2110 int error; 2111 2112 if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) 2113 return (EBADF); 2114 2115 FILE_USE(fp); 2116 2117 vp = (struct vnode *)fp->f_data; 2118 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2119 error = ESPIPE; 2120 goto out; 2121 } 2122 2123 switch (SCARG(uap, whence)) { 2124 case SEEK_CUR: 2125 newoff = fp->f_offset + SCARG(uap, offset); 2126 break; 2127 case SEEK_END: 2128 error = VOP_GETATTR(vp, &vattr, cred, l); 2129 if (error) 2130 goto out; 2131 newoff = SCARG(uap, offset) + vattr.va_size; 2132 break; 2133 case SEEK_SET: 2134 newoff = SCARG(uap, offset); 2135 break; 2136 default: 2137 error = EINVAL; 2138 goto out; 2139 } 2140 if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) 2141 goto out; 2142 2143 *(off_t *)retval = fp->f_offset = newoff; 2144 out: 2145 FILE_UNUSE(fp, l); 2146 return (error); 2147 } 2148 2149 /* 2150 * Positional read system call. 2151 */ 2152 int 2153 sys_pread(struct lwp *l, void *v, register_t *retval) 2154 { 2155 struct sys_pread_args /* { 2156 syscallarg(int) fd; 2157 syscallarg(void *) buf; 2158 syscallarg(size_t) nbyte; 2159 syscallarg(off_t) offset; 2160 } */ *uap = v; 2161 struct proc *p = l->l_proc; 2162 struct filedesc *fdp = p->p_fd; 2163 struct file *fp; 2164 struct vnode *vp; 2165 off_t offset; 2166 int error, fd = SCARG(uap, fd); 2167 2168 if ((fp = fd_getfile(fdp, fd)) == NULL) 2169 return (EBADF); 2170 2171 if ((fp->f_flag & FREAD) == 0) { 2172 simple_unlock(&fp->f_slock); 2173 return (EBADF); 2174 } 2175 2176 FILE_USE(fp); 2177 2178 vp = (struct vnode *)fp->f_data; 2179 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2180 error = ESPIPE; 2181 goto out; 2182 } 2183 2184 offset = SCARG(uap, offset); 2185 2186 /* 2187 * XXX This works because no file systems actually 2188 * XXX take any action on the seek operation. 2189 */ 2190 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2191 goto out; 2192 2193 /* dofileread() will unuse the descriptor for us */ 2194 return (dofileread(l, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2195 &offset, 0, retval)); 2196 2197 out: 2198 FILE_UNUSE(fp, l); 2199 return (error); 2200 } 2201 2202 /* 2203 * Positional scatter read system call. 2204 */ 2205 int 2206 sys_preadv(struct lwp *l, void *v, register_t *retval) 2207 { 2208 struct sys_preadv_args /* { 2209 syscallarg(int) fd; 2210 syscallarg(const struct iovec *) iovp; 2211 syscallarg(int) iovcnt; 2212 syscallarg(off_t) offset; 2213 } */ *uap = v; 2214 struct proc *p = l->l_proc; 2215 struct filedesc *fdp = p->p_fd; 2216 struct file *fp; 2217 struct vnode *vp; 2218 off_t offset; 2219 int error, fd = SCARG(uap, fd); 2220 2221 if ((fp = fd_getfile(fdp, fd)) == NULL) 2222 return (EBADF); 2223 2224 if ((fp->f_flag & FREAD) == 0) { 2225 simple_unlock(&fp->f_slock); 2226 return (EBADF); 2227 } 2228 2229 FILE_USE(fp); 2230 2231 vp = (struct vnode *)fp->f_data; 2232 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2233 error = ESPIPE; 2234 goto out; 2235 } 2236 2237 offset = SCARG(uap, offset); 2238 2239 /* 2240 * XXX This works because no file systems actually 2241 * XXX take any action on the seek operation. 2242 */ 2243 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2244 goto out; 2245 2246 /* dofilereadv() will unuse the descriptor for us */ 2247 return (dofilereadv(l, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 2248 &offset, 0, retval)); 2249 2250 out: 2251 FILE_UNUSE(fp, l); 2252 return (error); 2253 } 2254 2255 /* 2256 * Positional write system call. 2257 */ 2258 int 2259 sys_pwrite(struct lwp *l, void *v, register_t *retval) 2260 { 2261 struct sys_pwrite_args /* { 2262 syscallarg(int) fd; 2263 syscallarg(const void *) buf; 2264 syscallarg(size_t) nbyte; 2265 syscallarg(off_t) offset; 2266 } */ *uap = v; 2267 struct proc *p = l->l_proc; 2268 struct filedesc *fdp = p->p_fd; 2269 struct file *fp; 2270 struct vnode *vp; 2271 off_t offset; 2272 int error, fd = SCARG(uap, fd); 2273 2274 if ((fp = fd_getfile(fdp, fd)) == NULL) 2275 return (EBADF); 2276 2277 if ((fp->f_flag & FWRITE) == 0) { 2278 simple_unlock(&fp->f_slock); 2279 return (EBADF); 2280 } 2281 2282 FILE_USE(fp); 2283 2284 vp = (struct vnode *)fp->f_data; 2285 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2286 error = ESPIPE; 2287 goto out; 2288 } 2289 2290 offset = SCARG(uap, offset); 2291 2292 /* 2293 * XXX This works because no file systems actually 2294 * XXX take any action on the seek operation. 2295 */ 2296 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2297 goto out; 2298 2299 /* dofilewrite() will unuse the descriptor for us */ 2300 return (dofilewrite(l, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), 2301 &offset, 0, retval)); 2302 2303 out: 2304 FILE_UNUSE(fp, l); 2305 return (error); 2306 } 2307 2308 /* 2309 * Positional gather write system call. 2310 */ 2311 int 2312 sys_pwritev(struct lwp *l, void *v, register_t *retval) 2313 { 2314 struct sys_pwritev_args /* { 2315 syscallarg(int) fd; 2316 syscallarg(const struct iovec *) iovp; 2317 syscallarg(int) iovcnt; 2318 syscallarg(off_t) offset; 2319 } */ *uap = v; 2320 struct proc *p = l->l_proc; 2321 struct filedesc *fdp = p->p_fd; 2322 struct file *fp; 2323 struct vnode *vp; 2324 off_t offset; 2325 int error, fd = SCARG(uap, fd); 2326 2327 if ((fp = fd_getfile(fdp, fd)) == NULL) 2328 return (EBADF); 2329 2330 if ((fp->f_flag & FWRITE) == 0) { 2331 simple_unlock(&fp->f_slock); 2332 return (EBADF); 2333 } 2334 2335 FILE_USE(fp); 2336 2337 vp = (struct vnode *)fp->f_data; 2338 if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { 2339 error = ESPIPE; 2340 goto out; 2341 } 2342 2343 offset = SCARG(uap, offset); 2344 2345 /* 2346 * XXX This works because no file systems actually 2347 * XXX take any action on the seek operation. 2348 */ 2349 if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) 2350 goto out; 2351 2352 /* dofilewritev() will unuse the descriptor for us */ 2353 return (dofilewritev(l, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), 2354 &offset, 0, retval)); 2355 2356 out: 2357 FILE_UNUSE(fp, l); 2358 return (error); 2359 } 2360 2361 /* 2362 * Check access permissions. 2363 */ 2364 int 2365 sys_access(struct lwp *l, void *v, register_t *retval) 2366 { 2367 struct sys_access_args /* { 2368 syscallarg(const char *) path; 2369 syscallarg(int) flags; 2370 } */ *uap = v; 2371 kauth_cred_t cred; 2372 struct vnode *vp; 2373 int error, flags; 2374 struct nameidata nd; 2375 2376 if ((SCARG(uap, flags) & ~(R_OK | W_OK | X_OK)) != 0) { 2377 /* nonsense flags */ 2378 return EINVAL; 2379 } 2380 2381 cred = kauth_cred_dup(l->l_cred); 2382 kauth_cred_seteuid(cred, kauth_cred_getuid(l->l_cred)); 2383 kauth_cred_setegid(cred, kauth_cred_getgid(l->l_cred)); 2384 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2385 SCARG(uap, path), l); 2386 /* Override default credentials */ 2387 nd.ni_cnd.cn_cred = cred; 2388 if ((error = namei(&nd)) != 0) 2389 goto out; 2390 vp = nd.ni_vp; 2391 2392 /* Flags == 0 means only check for existence. */ 2393 if (SCARG(uap, flags)) { 2394 flags = 0; 2395 if (SCARG(uap, flags) & R_OK) 2396 flags |= VREAD; 2397 if (SCARG(uap, flags) & W_OK) 2398 flags |= VWRITE; 2399 if (SCARG(uap, flags) & X_OK) 2400 flags |= VEXEC; 2401 2402 error = VOP_ACCESS(vp, flags, cred, l); 2403 if (!error && (flags & VWRITE)) 2404 error = vn_writechk(vp); 2405 } 2406 vput(vp); 2407 out: 2408 kauth_cred_free(cred); 2409 return (error); 2410 } 2411 2412 /* 2413 * Get file status; this version follows links. 2414 */ 2415 /* ARGSUSED */ 2416 int 2417 sys___stat30(struct lwp *l, void *v, register_t *retval) 2418 { 2419 struct sys___stat30_args /* { 2420 syscallarg(const char *) path; 2421 syscallarg(struct stat *) ub; 2422 } */ *uap = v; 2423 struct stat sb; 2424 int error; 2425 struct nameidata nd; 2426 2427 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2428 SCARG(uap, path), l); 2429 if ((error = namei(&nd)) != 0) 2430 return (error); 2431 error = vn_stat(nd.ni_vp, &sb, l); 2432 vput(nd.ni_vp); 2433 if (error) 2434 return (error); 2435 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2436 return (error); 2437 } 2438 2439 /* 2440 * Get file status; this version does not follow links. 2441 */ 2442 /* ARGSUSED */ 2443 int 2444 sys___lstat30(struct lwp *l, void *v, register_t *retval) 2445 { 2446 struct sys___lstat30_args /* { 2447 syscallarg(const char *) path; 2448 syscallarg(struct stat *) ub; 2449 } */ *uap = v; 2450 struct stat sb; 2451 int error; 2452 struct nameidata nd; 2453 2454 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2455 SCARG(uap, path), l); 2456 if ((error = namei(&nd)) != 0) 2457 return (error); 2458 error = vn_stat(nd.ni_vp, &sb, l); 2459 vput(nd.ni_vp); 2460 if (error) 2461 return (error); 2462 error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); 2463 return (error); 2464 } 2465 2466 /* 2467 * Get configurable pathname variables. 2468 */ 2469 /* ARGSUSED */ 2470 int 2471 sys_pathconf(struct lwp *l, void *v, register_t *retval) 2472 { 2473 struct sys_pathconf_args /* { 2474 syscallarg(const char *) path; 2475 syscallarg(int) name; 2476 } */ *uap = v; 2477 int error; 2478 struct nameidata nd; 2479 2480 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, 2481 SCARG(uap, path), l); 2482 if ((error = namei(&nd)) != 0) 2483 return (error); 2484 error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); 2485 vput(nd.ni_vp); 2486 return (error); 2487 } 2488 2489 /* 2490 * Return target name of a symbolic link. 2491 */ 2492 /* ARGSUSED */ 2493 int 2494 sys_readlink(struct lwp *l, void *v, register_t *retval) 2495 { 2496 struct sys_readlink_args /* { 2497 syscallarg(const char *) path; 2498 syscallarg(char *) buf; 2499 syscallarg(size_t) count; 2500 } */ *uap = v; 2501 struct vnode *vp; 2502 struct iovec aiov; 2503 struct uio auio; 2504 int error; 2505 struct nameidata nd; 2506 2507 NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, 2508 SCARG(uap, path), l); 2509 if ((error = namei(&nd)) != 0) 2510 return (error); 2511 vp = nd.ni_vp; 2512 if (vp->v_type != VLNK) 2513 error = EINVAL; 2514 else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || 2515 (error = VOP_ACCESS(vp, VREAD, l->l_cred, l)) == 0) { 2516 aiov.iov_base = SCARG(uap, buf); 2517 aiov.iov_len = SCARG(uap, count); 2518 auio.uio_iov = &aiov; 2519 auio.uio_iovcnt = 1; 2520 auio.uio_offset = 0; 2521 auio.uio_rw = UIO_READ; 2522 KASSERT(l == curlwp); 2523 auio.uio_vmspace = l->l_proc->p_vmspace; 2524 auio.uio_resid = SCARG(uap, count); 2525 error = VOP_READLINK(vp, &auio, l->l_cred); 2526 } 2527 vput(vp); 2528 *retval = SCARG(uap, count) - auio.uio_resid; 2529 return (error); 2530 } 2531 2532 /* 2533 * Change flags of a file given a path name. 2534 */ 2535 /* ARGSUSED */ 2536 int 2537 sys_chflags(struct lwp *l, void *v, register_t *retval) 2538 { 2539 struct sys_chflags_args /* { 2540 syscallarg(const char *) path; 2541 syscallarg(u_long) flags; 2542 } */ *uap = v; 2543 struct vnode *vp; 2544 int error; 2545 struct nameidata nd; 2546 2547 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2548 if ((error = namei(&nd)) != 0) 2549 return (error); 2550 vp = nd.ni_vp; 2551 error = change_flags(vp, SCARG(uap, flags), l); 2552 vput(vp); 2553 return (error); 2554 } 2555 2556 /* 2557 * Change flags of a file given a file descriptor. 2558 */ 2559 /* ARGSUSED */ 2560 int 2561 sys_fchflags(struct lwp *l, void *v, register_t *retval) 2562 { 2563 struct sys_fchflags_args /* { 2564 syscallarg(int) fd; 2565 syscallarg(u_long) flags; 2566 } */ *uap = v; 2567 struct proc *p = l->l_proc; 2568 struct vnode *vp; 2569 struct file *fp; 2570 int error; 2571 2572 /* getvnode() will use the descriptor for us */ 2573 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2574 return (error); 2575 vp = (struct vnode *)fp->f_data; 2576 error = change_flags(vp, SCARG(uap, flags), l); 2577 VOP_UNLOCK(vp, 0); 2578 FILE_UNUSE(fp, l); 2579 return (error); 2580 } 2581 2582 /* 2583 * Change flags of a file given a path name; this version does 2584 * not follow links. 2585 */ 2586 int 2587 sys_lchflags(struct lwp *l, void *v, register_t *retval) 2588 { 2589 struct sys_lchflags_args /* { 2590 syscallarg(const char *) path; 2591 syscallarg(u_long) flags; 2592 } */ *uap = v; 2593 struct vnode *vp; 2594 int error; 2595 struct nameidata nd; 2596 2597 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2598 if ((error = namei(&nd)) != 0) 2599 return (error); 2600 vp = nd.ni_vp; 2601 error = change_flags(vp, SCARG(uap, flags), l); 2602 vput(vp); 2603 return (error); 2604 } 2605 2606 /* 2607 * Common routine to change flags of a file. 2608 */ 2609 int 2610 change_flags(struct vnode *vp, u_long flags, struct lwp *l) 2611 { 2612 struct mount *mp; 2613 struct vattr vattr; 2614 int error; 2615 2616 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2617 return (error); 2618 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 2619 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2620 /* 2621 * Non-superusers cannot change the flags on devices, even if they 2622 * own them. 2623 */ 2624 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, 2625 &l->l_acflag) != 0) { 2626 if ((error = VOP_GETATTR(vp, &vattr, l->l_cred, l)) != 0) 2627 goto out; 2628 if (vattr.va_type == VCHR || vattr.va_type == VBLK) { 2629 error = EINVAL; 2630 goto out; 2631 } 2632 } 2633 VATTR_NULL(&vattr); 2634 vattr.va_flags = flags; 2635 error = VOP_SETATTR(vp, &vattr, l->l_cred, l); 2636 out: 2637 vn_finished_write(mp, 0); 2638 return (error); 2639 } 2640 2641 /* 2642 * Change mode of a file given path name; this version follows links. 2643 */ 2644 /* ARGSUSED */ 2645 int 2646 sys_chmod(struct lwp *l, void *v, register_t *retval) 2647 { 2648 struct sys_chmod_args /* { 2649 syscallarg(const char *) path; 2650 syscallarg(int) mode; 2651 } */ *uap = v; 2652 int error; 2653 struct nameidata nd; 2654 2655 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2656 if ((error = namei(&nd)) != 0) 2657 return (error); 2658 2659 error = change_mode(nd.ni_vp, SCARG(uap, mode), l); 2660 2661 vrele(nd.ni_vp); 2662 return (error); 2663 } 2664 2665 /* 2666 * Change mode of a file given a file descriptor. 2667 */ 2668 /* ARGSUSED */ 2669 int 2670 sys_fchmod(struct lwp *l, void *v, register_t *retval) 2671 { 2672 struct sys_fchmod_args /* { 2673 syscallarg(int) fd; 2674 syscallarg(int) mode; 2675 } */ *uap = v; 2676 struct proc *p = l->l_proc; 2677 struct file *fp; 2678 int error; 2679 2680 /* getvnode() will use the descriptor for us */ 2681 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2682 return (error); 2683 2684 error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), l); 2685 FILE_UNUSE(fp, l); 2686 return (error); 2687 } 2688 2689 /* 2690 * Change mode of a file given path name; this version does not follow links. 2691 */ 2692 /* ARGSUSED */ 2693 int 2694 sys_lchmod(struct lwp *l, void *v, register_t *retval) 2695 { 2696 struct sys_lchmod_args /* { 2697 syscallarg(const char *) path; 2698 syscallarg(int) mode; 2699 } */ *uap = v; 2700 int error; 2701 struct nameidata nd; 2702 2703 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2704 if ((error = namei(&nd)) != 0) 2705 return (error); 2706 2707 error = change_mode(nd.ni_vp, SCARG(uap, mode), l); 2708 2709 vrele(nd.ni_vp); 2710 return (error); 2711 } 2712 2713 /* 2714 * Common routine to set mode given a vnode. 2715 */ 2716 static int 2717 change_mode(struct vnode *vp, int mode, struct lwp *l) 2718 { 2719 struct mount *mp; 2720 struct vattr vattr; 2721 int error; 2722 2723 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2724 return (error); 2725 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 2726 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2727 VATTR_NULL(&vattr); 2728 vattr.va_mode = mode & ALLPERMS; 2729 error = VOP_SETATTR(vp, &vattr, l->l_cred, l); 2730 VOP_UNLOCK(vp, 0); 2731 vn_finished_write(mp, 0); 2732 return (error); 2733 } 2734 2735 /* 2736 * Set ownership given a path name; this version follows links. 2737 */ 2738 /* ARGSUSED */ 2739 int 2740 sys_chown(struct lwp *l, void *v, register_t *retval) 2741 { 2742 struct sys_chown_args /* { 2743 syscallarg(const char *) path; 2744 syscallarg(uid_t) uid; 2745 syscallarg(gid_t) gid; 2746 } */ *uap = v; 2747 int error; 2748 struct nameidata nd; 2749 2750 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2751 if ((error = namei(&nd)) != 0) 2752 return (error); 2753 2754 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); 2755 2756 vrele(nd.ni_vp); 2757 return (error); 2758 } 2759 2760 /* 2761 * Set ownership given a path name; this version follows links. 2762 * Provides POSIX semantics. 2763 */ 2764 /* ARGSUSED */ 2765 int 2766 sys___posix_chown(struct lwp *l, void *v, register_t *retval) 2767 { 2768 struct sys_chown_args /* { 2769 syscallarg(const char *) path; 2770 syscallarg(uid_t) uid; 2771 syscallarg(gid_t) gid; 2772 } */ *uap = v; 2773 int error; 2774 struct nameidata nd; 2775 2776 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2777 if ((error = namei(&nd)) != 0) 2778 return (error); 2779 2780 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 2781 2782 vrele(nd.ni_vp); 2783 return (error); 2784 } 2785 2786 /* 2787 * Set ownership given a file descriptor. 2788 */ 2789 /* ARGSUSED */ 2790 int 2791 sys_fchown(struct lwp *l, void *v, register_t *retval) 2792 { 2793 struct sys_fchown_args /* { 2794 syscallarg(int) fd; 2795 syscallarg(uid_t) uid; 2796 syscallarg(gid_t) gid; 2797 } */ *uap = v; 2798 struct proc *p = l->l_proc; 2799 int error; 2800 struct file *fp; 2801 2802 /* getvnode() will use the descriptor for us */ 2803 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2804 return (error); 2805 2806 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2807 SCARG(uap, gid), l, 0); 2808 FILE_UNUSE(fp, l); 2809 return (error); 2810 } 2811 2812 /* 2813 * Set ownership given a file descriptor, providing POSIX/XPG semantics. 2814 */ 2815 /* ARGSUSED */ 2816 int 2817 sys___posix_fchown(struct lwp *l, void *v, register_t *retval) 2818 { 2819 struct sys_fchown_args /* { 2820 syscallarg(int) fd; 2821 syscallarg(uid_t) uid; 2822 syscallarg(gid_t) gid; 2823 } */ *uap = v; 2824 struct proc *p = l->l_proc; 2825 int error; 2826 struct file *fp; 2827 2828 /* getvnode() will use the descriptor for us */ 2829 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2830 return (error); 2831 2832 error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), 2833 SCARG(uap, gid), l, 1); 2834 FILE_UNUSE(fp, l); 2835 return (error); 2836 } 2837 2838 /* 2839 * Set ownership given a path name; this version does not follow links. 2840 */ 2841 /* ARGSUSED */ 2842 int 2843 sys_lchown(struct lwp *l, void *v, register_t *retval) 2844 { 2845 struct sys_lchown_args /* { 2846 syscallarg(const char *) path; 2847 syscallarg(uid_t) uid; 2848 syscallarg(gid_t) gid; 2849 } */ *uap = v; 2850 int error; 2851 struct nameidata nd; 2852 2853 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2854 if ((error = namei(&nd)) != 0) 2855 return (error); 2856 2857 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 0); 2858 2859 vrele(nd.ni_vp); 2860 return (error); 2861 } 2862 2863 /* 2864 * Set ownership given a path name; this version does not follow links. 2865 * Provides POSIX/XPG semantics. 2866 */ 2867 /* ARGSUSED */ 2868 int 2869 sys___posix_lchown(struct lwp *l, void *v, register_t *retval) 2870 { 2871 struct sys_lchown_args /* { 2872 syscallarg(const char *) path; 2873 syscallarg(uid_t) uid; 2874 syscallarg(gid_t) gid; 2875 } */ *uap = v; 2876 int error; 2877 struct nameidata nd; 2878 2879 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2880 if ((error = namei(&nd)) != 0) 2881 return (error); 2882 2883 error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), l, 1); 2884 2885 vrele(nd.ni_vp); 2886 return (error); 2887 } 2888 2889 /* 2890 * Common routine to set ownership given a vnode. 2891 */ 2892 static int 2893 change_owner(struct vnode *vp, uid_t uid, gid_t gid, struct lwp *l, 2894 int posix_semantics) 2895 { 2896 struct mount *mp; 2897 struct vattr vattr; 2898 mode_t newmode; 2899 int error; 2900 2901 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 2902 return (error); 2903 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 2904 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 2905 if ((error = VOP_GETATTR(vp, &vattr, l->l_cred, l)) != 0) 2906 goto out; 2907 2908 #define CHANGED(x) ((int)(x) != -1) 2909 newmode = vattr.va_mode; 2910 if (posix_semantics) { 2911 /* 2912 * POSIX/XPG semantics: if the caller is not the super-user, 2913 * clear set-user-id and set-group-id bits. Both POSIX and 2914 * the XPG consider the behaviour for calls by the super-user 2915 * implementation-defined; we leave the set-user-id and set- 2916 * group-id settings intact in that case. 2917 */ 2918 if (kauth_authorize_generic(l->l_cred, KAUTH_GENERIC_ISSUSER, 2919 NULL) != 0) 2920 newmode &= ~(S_ISUID | S_ISGID); 2921 } else { 2922 /* 2923 * NetBSD semantics: when changing owner and/or group, 2924 * clear the respective bit(s). 2925 */ 2926 if (CHANGED(uid)) 2927 newmode &= ~S_ISUID; 2928 if (CHANGED(gid)) 2929 newmode &= ~S_ISGID; 2930 } 2931 /* Update va_mode iff altered. */ 2932 if (vattr.va_mode == newmode) 2933 newmode = VNOVAL; 2934 2935 VATTR_NULL(&vattr); 2936 vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; 2937 vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; 2938 vattr.va_mode = newmode; 2939 error = VOP_SETATTR(vp, &vattr, l->l_cred, l); 2940 #undef CHANGED 2941 2942 out: 2943 VOP_UNLOCK(vp, 0); 2944 vn_finished_write(mp, 0); 2945 return (error); 2946 } 2947 2948 /* 2949 * Set the access and modification times given a path name; this 2950 * version follows links. 2951 */ 2952 /* ARGSUSED */ 2953 int 2954 sys_utimes(struct lwp *l, void *v, register_t *retval) 2955 { 2956 struct sys_utimes_args /* { 2957 syscallarg(const char *) path; 2958 syscallarg(const struct timeval *) tptr; 2959 } */ *uap = v; 2960 int error; 2961 struct nameidata nd; 2962 2963 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 2964 if ((error = namei(&nd)) != 0) 2965 return (error); 2966 2967 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), l); 2968 2969 vrele(nd.ni_vp); 2970 return (error); 2971 } 2972 2973 /* 2974 * Set the access and modification times given a file descriptor. 2975 */ 2976 /* ARGSUSED */ 2977 int 2978 sys_futimes(struct lwp *l, void *v, register_t *retval) 2979 { 2980 struct sys_futimes_args /* { 2981 syscallarg(int) fd; 2982 syscallarg(const struct timeval *) tptr; 2983 } */ *uap = v; 2984 struct proc *p = l->l_proc; 2985 int error; 2986 struct file *fp; 2987 2988 /* getvnode() will use the descriptor for us */ 2989 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 2990 return (error); 2991 2992 error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), l); 2993 FILE_UNUSE(fp, l); 2994 return (error); 2995 } 2996 2997 /* 2998 * Set the access and modification times given a path name; this 2999 * version does not follow links. 3000 */ 3001 /* ARGSUSED */ 3002 int 3003 sys_lutimes(struct lwp *l, void *v, register_t *retval) 3004 { 3005 struct sys_lutimes_args /* { 3006 syscallarg(const char *) path; 3007 syscallarg(const struct timeval *) tptr; 3008 } */ *uap = v; 3009 int error; 3010 struct nameidata nd; 3011 3012 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 3013 if ((error = namei(&nd)) != 0) 3014 return (error); 3015 3016 error = change_utimes(nd.ni_vp, SCARG(uap, tptr), l); 3017 3018 vrele(nd.ni_vp); 3019 return (error); 3020 } 3021 3022 /* 3023 * Common routine to set access and modification times given a vnode. 3024 */ 3025 static int 3026 change_utimes(struct vnode *vp, const struct timeval *tptr, struct lwp *l) 3027 { 3028 struct mount *mp; 3029 struct vattr vattr; 3030 int error; 3031 3032 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 3033 return (error); 3034 VATTR_NULL(&vattr); 3035 if (tptr == NULL) { 3036 nanotime(&vattr.va_atime); 3037 vattr.va_mtime = vattr.va_atime; 3038 vattr.va_vaflags |= VA_UTIMES_NULL; 3039 } else { 3040 struct timeval tv[2]; 3041 3042 error = copyin(tptr, tv, sizeof(tv)); 3043 if (error) 3044 goto out; 3045 TIMEVAL_TO_TIMESPEC(&tv[0], &vattr.va_atime); 3046 TIMEVAL_TO_TIMESPEC(&tv[1], &vattr.va_mtime); 3047 } 3048 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 3049 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3050 error = VOP_SETATTR(vp, &vattr, l->l_cred, l); 3051 VOP_UNLOCK(vp, 0); 3052 out: 3053 vn_finished_write(mp, 0); 3054 return (error); 3055 } 3056 3057 /* 3058 * Truncate a file given its path name. 3059 */ 3060 /* ARGSUSED */ 3061 int 3062 sys_truncate(struct lwp *l, void *v, register_t *retval) 3063 { 3064 struct sys_truncate_args /* { 3065 syscallarg(const char *) path; 3066 syscallarg(int) pad; 3067 syscallarg(off_t) length; 3068 } */ *uap = v; 3069 struct vnode *vp; 3070 struct mount *mp; 3071 struct vattr vattr; 3072 int error; 3073 struct nameidata nd; 3074 3075 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 3076 if ((error = namei(&nd)) != 0) 3077 return (error); 3078 vp = nd.ni_vp; 3079 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 3080 vrele(vp); 3081 return (error); 3082 } 3083 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 3084 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3085 if (vp->v_type == VDIR) 3086 error = EISDIR; 3087 else if ((error = vn_writechk(vp)) == 0 && 3088 (error = VOP_ACCESS(vp, VWRITE, l->l_cred, l)) == 0) { 3089 VATTR_NULL(&vattr); 3090 vattr.va_size = SCARG(uap, length); 3091 error = VOP_SETATTR(vp, &vattr, l->l_cred, l); 3092 } 3093 vput(vp); 3094 vn_finished_write(mp, 0); 3095 return (error); 3096 } 3097 3098 /* 3099 * Truncate a file given a file descriptor. 3100 */ 3101 /* ARGSUSED */ 3102 int 3103 sys_ftruncate(struct lwp *l, void *v, register_t *retval) 3104 { 3105 struct sys_ftruncate_args /* { 3106 syscallarg(int) fd; 3107 syscallarg(int) pad; 3108 syscallarg(off_t) length; 3109 } */ *uap = v; 3110 struct proc *p = l->l_proc; 3111 struct mount *mp; 3112 struct vattr vattr; 3113 struct vnode *vp; 3114 struct file *fp; 3115 int error; 3116 3117 /* getvnode() will use the descriptor for us */ 3118 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3119 return (error); 3120 if ((fp->f_flag & FWRITE) == 0) { 3121 error = EINVAL; 3122 goto out; 3123 } 3124 vp = (struct vnode *)fp->f_data; 3125 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 3126 FILE_UNUSE(fp, l); 3127 return (error); 3128 } 3129 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 3130 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3131 if (vp->v_type == VDIR) 3132 error = EISDIR; 3133 else if ((error = vn_writechk(vp)) == 0) { 3134 VATTR_NULL(&vattr); 3135 vattr.va_size = SCARG(uap, length); 3136 error = VOP_SETATTR(vp, &vattr, fp->f_cred, l); 3137 } 3138 VOP_UNLOCK(vp, 0); 3139 vn_finished_write(mp, 0); 3140 out: 3141 FILE_UNUSE(fp, l); 3142 return (error); 3143 } 3144 3145 /* 3146 * Sync an open file. 3147 */ 3148 /* ARGSUSED */ 3149 int 3150 sys_fsync(struct lwp *l, void *v, register_t *retval) 3151 { 3152 struct sys_fsync_args /* { 3153 syscallarg(int) fd; 3154 } */ *uap = v; 3155 struct proc *p = l->l_proc; 3156 struct vnode *vp; 3157 struct mount *mp; 3158 struct file *fp; 3159 int error; 3160 3161 /* getvnode() will use the descriptor for us */ 3162 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3163 return (error); 3164 vp = (struct vnode *)fp->f_data; 3165 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { 3166 FILE_UNUSE(fp, l); 3167 return (error); 3168 } 3169 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3170 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, l); 3171 if (error == 0 && bioops.io_fsync != NULL && 3172 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 3173 (*bioops.io_fsync)(vp, 0); 3174 VOP_UNLOCK(vp, 0); 3175 vn_finished_write(mp, 0); 3176 FILE_UNUSE(fp, l); 3177 return (error); 3178 } 3179 3180 /* 3181 * Sync a range of file data. API modeled after that found in AIX. 3182 * 3183 * FDATASYNC indicates that we need only save enough metadata to be able 3184 * to re-read the written data. Note we duplicate AIX's requirement that 3185 * the file be open for writing. 3186 */ 3187 /* ARGSUSED */ 3188 int 3189 sys_fsync_range(struct lwp *l, void *v, register_t *retval) 3190 { 3191 struct sys_fsync_range_args /* { 3192 syscallarg(int) fd; 3193 syscallarg(int) flags; 3194 syscallarg(off_t) start; 3195 syscallarg(off_t) length; 3196 } */ *uap = v; 3197 struct proc *p = l->l_proc; 3198 struct vnode *vp; 3199 struct file *fp; 3200 int flags, nflags; 3201 off_t s, e, len; 3202 int error; 3203 3204 /* getvnode() will use the descriptor for us */ 3205 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3206 return (error); 3207 3208 if ((fp->f_flag & FWRITE) == 0) { 3209 error = EBADF; 3210 goto out; 3211 } 3212 3213 flags = SCARG(uap, flags); 3214 if (((flags & (FDATASYNC | FFILESYNC)) == 0) || 3215 ((~flags & (FDATASYNC | FFILESYNC)) == 0)) { 3216 error = EINVAL; 3217 goto out; 3218 } 3219 /* Now set up the flags for value(s) to pass to VOP_FSYNC() */ 3220 if (flags & FDATASYNC) 3221 nflags = FSYNC_DATAONLY | FSYNC_WAIT; 3222 else 3223 nflags = FSYNC_WAIT; 3224 if (flags & FDISKSYNC) 3225 nflags |= FSYNC_CACHE; 3226 3227 len = SCARG(uap, length); 3228 /* If length == 0, we do the whole file, and s = l = 0 will do that */ 3229 if (len) { 3230 s = SCARG(uap, start); 3231 e = s + len; 3232 if (e < s) { 3233 error = EINVAL; 3234 goto out; 3235 } 3236 } else { 3237 e = 0; 3238 s = 0; 3239 } 3240 3241 vp = (struct vnode *)fp->f_data; 3242 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3243 error = VOP_FSYNC(vp, fp->f_cred, nflags, s, e, l); 3244 3245 if (error == 0 && bioops.io_fsync != NULL && 3246 vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) 3247 (*bioops.io_fsync)(vp, nflags); 3248 3249 VOP_UNLOCK(vp, 0); 3250 out: 3251 FILE_UNUSE(fp, l); 3252 return (error); 3253 } 3254 3255 /* 3256 * Sync the data of an open file. 3257 */ 3258 /* ARGSUSED */ 3259 int 3260 sys_fdatasync(struct lwp *l, void *v, register_t *retval) 3261 { 3262 struct sys_fdatasync_args /* { 3263 syscallarg(int) fd; 3264 } */ *uap = v; 3265 struct proc *p = l->l_proc; 3266 struct vnode *vp; 3267 struct file *fp; 3268 int error; 3269 3270 /* getvnode() will use the descriptor for us */ 3271 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3272 return (error); 3273 if ((fp->f_flag & FWRITE) == 0) { 3274 FILE_UNUSE(fp, l); 3275 return (EBADF); 3276 } 3277 vp = (struct vnode *)fp->f_data; 3278 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3279 error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, l); 3280 VOP_UNLOCK(vp, 0); 3281 FILE_UNUSE(fp, l); 3282 return (error); 3283 } 3284 3285 /* 3286 * Rename files, (standard) BSD semantics frontend. 3287 */ 3288 /* ARGSUSED */ 3289 int 3290 sys_rename(struct lwp *l, void *v, register_t *retval) 3291 { 3292 struct sys_rename_args /* { 3293 syscallarg(const char *) from; 3294 syscallarg(const char *) to; 3295 } */ *uap = v; 3296 3297 return (rename_files(SCARG(uap, from), SCARG(uap, to), l, 0)); 3298 } 3299 3300 /* 3301 * Rename files, POSIX semantics frontend. 3302 */ 3303 /* ARGSUSED */ 3304 int 3305 sys___posix_rename(struct lwp *l, void *v, register_t *retval) 3306 { 3307 struct sys___posix_rename_args /* { 3308 syscallarg(const char *) from; 3309 syscallarg(const char *) to; 3310 } */ *uap = v; 3311 3312 return (rename_files(SCARG(uap, from), SCARG(uap, to), l, 1)); 3313 } 3314 3315 /* 3316 * Rename files. Source and destination must either both be directories, 3317 * or both not be directories. If target is a directory, it must be empty. 3318 * If `from' and `to' refer to the same object, the value of the `retain' 3319 * argument is used to determine whether `from' will be 3320 * 3321 * (retain == 0) deleted unless `from' and `to' refer to the same 3322 * object in the file system's name space (BSD). 3323 * (retain == 1) always retained (POSIX). 3324 */ 3325 static int 3326 rename_files(const char *from, const char *to, struct lwp *l, int retain) 3327 { 3328 struct mount *mp = NULL; 3329 struct vnode *tvp, *fvp, *tdvp; 3330 struct nameidata fromnd, tond; 3331 struct proc *p; 3332 int error; 3333 3334 NDINIT(&fromnd, DELETE, LOCKPARENT | SAVESTART, UIO_USERSPACE, 3335 from, l); 3336 if ((error = namei(&fromnd)) != 0) 3337 return (error); 3338 if (fromnd.ni_dvp != fromnd.ni_vp) 3339 VOP_UNLOCK(fromnd.ni_dvp, 0); 3340 fvp = fromnd.ni_vp; 3341 error = vn_start_write(fvp, &mp, V_WAIT | V_PCATCH); 3342 if (error != 0) { 3343 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3344 vrele(fromnd.ni_dvp); 3345 vrele(fvp); 3346 if (fromnd.ni_startdir) 3347 vrele(fromnd.ni_startdir); 3348 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3349 return (error); 3350 } 3351 NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | 3352 (fvp->v_type == VDIR ? CREATEDIR : 0), UIO_USERSPACE, to, l); 3353 if ((error = namei(&tond)) != 0) { 3354 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3355 vrele(fromnd.ni_dvp); 3356 vrele(fvp); 3357 goto out1; 3358 } 3359 tdvp = tond.ni_dvp; 3360 tvp = tond.ni_vp; 3361 3362 if (tvp != NULL) { 3363 if (fvp->v_type == VDIR && tvp->v_type != VDIR) { 3364 error = ENOTDIR; 3365 goto out; 3366 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { 3367 error = EISDIR; 3368 goto out; 3369 } 3370 } 3371 3372 if (fvp == tdvp) 3373 error = EINVAL; 3374 3375 /* 3376 * Source and destination refer to the same object. 3377 */ 3378 if (fvp == tvp) { 3379 if (retain) 3380 error = -1; 3381 else if (fromnd.ni_dvp == tdvp && 3382 fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && 3383 !memcmp(fromnd.ni_cnd.cn_nameptr, 3384 tond.ni_cnd.cn_nameptr, 3385 fromnd.ni_cnd.cn_namelen)) 3386 error = -1; 3387 } 3388 3389 #if NVERIEXEC > 0 3390 if (!error) { 3391 pathname_t frompath = NULL, topath = NULL; 3392 3393 error = pathname_get(fromnd.ni_dirp, fromnd.ni_segflg, 3394 &frompath); 3395 if (!error) 3396 error = pathname_get(tond.ni_dirp, tond.ni_segflg, 3397 &topath); 3398 if (!error) 3399 error = veriexec_renamechk(fvp, pathname_path(frompath), 3400 tvp, pathname_path(topath), l); 3401 3402 pathname_put(frompath); 3403 pathname_put(topath); 3404 } 3405 #endif /* NVERIEXEC > 0 */ 3406 3407 out: 3408 p = l->l_proc; 3409 if (!error) { 3410 VOP_LEASE(tdvp, l, l->l_cred, LEASE_WRITE); 3411 if (fromnd.ni_dvp != tdvp) 3412 VOP_LEASE(fromnd.ni_dvp, l, l->l_cred, LEASE_WRITE); 3413 if (tvp) { 3414 VOP_LEASE(tvp, l, l->l_cred, LEASE_WRITE); 3415 } 3416 error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, 3417 tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); 3418 } else { 3419 VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); 3420 if (tdvp == tvp) 3421 vrele(tdvp); 3422 else 3423 vput(tdvp); 3424 if (tvp) 3425 vput(tvp); 3426 VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); 3427 vrele(fromnd.ni_dvp); 3428 vrele(fvp); 3429 } 3430 vrele(tond.ni_startdir); 3431 PNBUF_PUT(tond.ni_cnd.cn_pnbuf); 3432 out1: 3433 vn_finished_write(mp, 0); 3434 if (fromnd.ni_startdir) 3435 vrele(fromnd.ni_startdir); 3436 PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); 3437 return (error == -1 ? 0 : error); 3438 } 3439 3440 /* 3441 * Make a directory file. 3442 */ 3443 /* ARGSUSED */ 3444 int 3445 sys_mkdir(struct lwp *l, void *v, register_t *retval) 3446 { 3447 struct sys_mkdir_args /* { 3448 syscallarg(const char *) path; 3449 syscallarg(int) mode; 3450 } */ *uap = v; 3451 struct proc *p = l->l_proc; 3452 struct mount *mp; 3453 struct vnode *vp; 3454 struct vattr vattr; 3455 int error; 3456 struct nameidata nd; 3457 3458 restart: 3459 NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR, UIO_USERSPACE, 3460 SCARG(uap, path), l); 3461 if ((error = namei(&nd)) != 0) 3462 return (error); 3463 vp = nd.ni_vp; 3464 if (vp != NULL) { 3465 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3466 if (nd.ni_dvp == vp) 3467 vrele(nd.ni_dvp); 3468 else 3469 vput(nd.ni_dvp); 3470 vrele(vp); 3471 return (EEXIST); 3472 } 3473 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3474 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3475 if (nd.ni_dvp == vp) 3476 vrele(nd.ni_dvp); 3477 else 3478 vput(nd.ni_dvp); 3479 if ((error = vn_start_write(NULL, &mp, 3480 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 3481 return (error); 3482 goto restart; 3483 } 3484 VATTR_NULL(&vattr); 3485 vattr.va_type = VDIR; 3486 vattr.va_mode = 3487 (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; 3488 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 3489 error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); 3490 if (!error) 3491 vput(nd.ni_vp); 3492 vn_finished_write(mp, 0); 3493 return (error); 3494 } 3495 3496 /* 3497 * Remove a directory file. 3498 */ 3499 /* ARGSUSED */ 3500 int 3501 sys_rmdir(struct lwp *l, void *v, register_t *retval) 3502 { 3503 struct sys_rmdir_args /* { 3504 syscallarg(const char *) path; 3505 } */ *uap = v; 3506 struct mount *mp; 3507 struct vnode *vp; 3508 int error; 3509 struct nameidata nd; 3510 3511 restart: 3512 NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, 3513 SCARG(uap, path), l); 3514 if ((error = namei(&nd)) != 0) 3515 return (error); 3516 vp = nd.ni_vp; 3517 if (vp->v_type != VDIR) { 3518 error = ENOTDIR; 3519 goto out; 3520 } 3521 /* 3522 * No rmdir "." please. 3523 */ 3524 if (nd.ni_dvp == vp) { 3525 error = EINVAL; 3526 goto out; 3527 } 3528 /* 3529 * The root of a mounted filesystem cannot be deleted. 3530 */ 3531 if (vp->v_flag & VROOT) { 3532 error = EBUSY; 3533 goto out; 3534 } 3535 if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { 3536 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3537 if (nd.ni_dvp == vp) 3538 vrele(nd.ni_dvp); 3539 else 3540 vput(nd.ni_dvp); 3541 vput(vp); 3542 if ((error = vn_start_write(NULL, &mp, 3543 V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) 3544 return (error); 3545 goto restart; 3546 } 3547 VOP_LEASE(nd.ni_dvp, l, l->l_cred, LEASE_WRITE); 3548 VOP_LEASE(vp, l, l->l_cred, LEASE_WRITE); 3549 error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); 3550 vn_finished_write(mp, 0); 3551 return (error); 3552 3553 out: 3554 VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); 3555 if (nd.ni_dvp == vp) 3556 vrele(nd.ni_dvp); 3557 else 3558 vput(nd.ni_dvp); 3559 vput(vp); 3560 return (error); 3561 } 3562 3563 /* 3564 * Read a block of directory entries in a file system independent format. 3565 */ 3566 int 3567 sys___getdents30(struct lwp *l, void *v, register_t *retval) 3568 { 3569 struct sys___getdents30_args /* { 3570 syscallarg(int) fd; 3571 syscallarg(char *) buf; 3572 syscallarg(size_t) count; 3573 } */ *uap = v; 3574 struct proc *p = l->l_proc; 3575 struct file *fp; 3576 int error, done; 3577 3578 /* getvnode() will use the descriptor for us */ 3579 if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) 3580 return (error); 3581 if ((fp->f_flag & FREAD) == 0) { 3582 error = EBADF; 3583 goto out; 3584 } 3585 error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, 3586 SCARG(uap, count), &done, l, 0, 0); 3587 #ifdef KTRACE 3588 if (!error && KTRPOINT(p, KTR_GENIO)) { 3589 struct iovec iov; 3590 iov.iov_base = SCARG(uap, buf); 3591 iov.iov_len = done; 3592 ktrgenio(l, SCARG(uap, fd), UIO_READ, &iov, done, 0); 3593 } 3594 #endif 3595 *retval = done; 3596 out: 3597 FILE_UNUSE(fp, l); 3598 return (error); 3599 } 3600 3601 /* 3602 * Set the mode mask for creation of filesystem nodes. 3603 */ 3604 int 3605 sys_umask(struct lwp *l, void *v, register_t *retval) 3606 { 3607 struct sys_umask_args /* { 3608 syscallarg(mode_t) newmask; 3609 } */ *uap = v; 3610 struct proc *p = l->l_proc; 3611 struct cwdinfo *cwdi; 3612 3613 cwdi = p->p_cwdi; 3614 *retval = cwdi->cwdi_cmask; 3615 cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; 3616 return (0); 3617 } 3618 3619 /* 3620 * Void all references to file by ripping underlying filesystem 3621 * away from vnode. 3622 */ 3623 /* ARGSUSED */ 3624 int 3625 sys_revoke(struct lwp *l, void *v, register_t *retval) 3626 { 3627 struct sys_revoke_args /* { 3628 syscallarg(const char *) path; 3629 } */ *uap = v; 3630 struct mount *mp; 3631 struct vnode *vp; 3632 struct vattr vattr; 3633 int error; 3634 struct nameidata nd; 3635 3636 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), l); 3637 if ((error = namei(&nd)) != 0) 3638 return (error); 3639 vp = nd.ni_vp; 3640 if ((error = VOP_GETATTR(vp, &vattr, l->l_cred, l)) != 0) 3641 goto out; 3642 if (kauth_cred_geteuid(l->l_cred) != vattr.va_uid && 3643 (error = kauth_authorize_generic(l->l_cred, 3644 KAUTH_GENERIC_ISSUSER, &l->l_acflag)) != 0) 3645 goto out; 3646 if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) 3647 goto out; 3648 if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) 3649 VOP_REVOKE(vp, REVOKEALL); 3650 vn_finished_write(mp, 0); 3651 out: 3652 vrele(vp); 3653 return (error); 3654 } 3655 3656 /* 3657 * Convert a user file descriptor to a kernel file entry. 3658 */ 3659 int 3660 getvnode(struct filedesc *fdp, int fd, struct file **fpp) 3661 { 3662 struct vnode *vp; 3663 struct file *fp; 3664 3665 if ((fp = fd_getfile(fdp, fd)) == NULL) 3666 return (EBADF); 3667 3668 FILE_USE(fp); 3669 3670 if (fp->f_type != DTYPE_VNODE) { 3671 FILE_UNUSE(fp, NULL); 3672 return (EINVAL); 3673 } 3674 3675 vp = (struct vnode *)fp->f_data; 3676 if (vp->v_type == VBAD) { 3677 FILE_UNUSE(fp, NULL); 3678 return (EBADF); 3679 } 3680 3681 *fpp = fp; 3682 return (0); 3683 }
Cache object: 11e6e13df8ce68605c982505a2f824be
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